Amazon's Unsuitable Inventory Investigations: The Supply-Chain File to Have Before Amazon Asks

By Bernardo Campelo, Forbes Business Council E-Commerce Leader, Amazon SPN Certified provider, Amazon SP-API authorized partner, and Founder of PrepVia.

As of October 29, 2026, Amazon's Unsuitable inventory investigations policy lets it withhold "some or all" of a seller's FBA inventory while it investigates, ask for information or documents about "your identity, product authenticity, and compliance with applicable laws," and dispose of the inventory "immediately" if the information does not arrive "by the stated deadlines." The page ties account deactivation to section F-7 of the FBA Service Terms in the Business Solutions Agreement, and says disposal follows the FBA Service Terms. It does not say how many days the seller gets: the deadline comes in the notice.

Amazon does not publish a document list for these investigations. The closest lists are on two other Amazon pages: the invoice requirements for appealing a policy violation, and the requirements for a responsible sourcing documentation request. Neither is written for this policy, but read together they describe the trail Amazon asks for in related reviews: invoices that cover sales and stock for each cited ASIN, traced back to the manufacturer.

This post is for distributors, wholesalers and authorized resellers with volume, and for the people who handle compliance for them. It lays out what each Amazon page says, what it does not say, and the file to build by ASIN before a notice arrives. The parts of the file that Amazon does not name are marked as our recommendation.

Every date and name below was checked on October 29, 2026 against Amazon's Business Solutions Agreement, its Seller Central help pages and its 2025 Trustworthy Shopping Experience Report, linked where they first appear. Amazon edits help pages without dating them. This is general information, not legal advice: if inventory is already held, talk to your attorney before you answer.

What the Policy Page Says, Line by Line

The page is short, and most of its verbs are "may." It opens with the reason: Amazon "strictly prohibit[s] the sale of counterfeit products and other illegal goods," and if it finds a seller has sold them through its fulfillment network, it may deactivate the account and offers "consistent with section F-7" of the FBA Service Terms. It adds: "We may also withhold and/or dispose of your inventory in order to protect our customers and sellers."

The trigger for the investigation is suspicion, not a finding. Amazon will notify you "if we require additional information about inventory that we have determined may constitute Unsuitable Units," and if inventory is withheld "due to suspected violations of our anti-counterfeit and restricted products policies, we will notify you by email and conduct an investigation." Keep the email address on the account monitored: that is where the notice, and its deadline, arrive.

Two lines matter most for planning. The first is "some or all": the hold can reach stock beyond the ASIN that started it, so the file has to exist for the catalog, not for one product. The second is the disposal clause. Amazon may dispose of inventory immediately if the information does not arrive in time, or if it finds Unsuitable Units, including through "submitting forged documents to Amazon." A late answer and a doctored invoice lead to the same place.

The Contract Behind It: F-7 and the Definition of an Unsuitable Unit

The policy page points to the Business Solutions Agreement, and the FBA Service Terms inside it carry the definitions. An "Unsuitable Unit" is a unit that is defective, damaged or missing required labels; whose labels were not properly registered or do not match the registered product; that "is an FBA Excluded Product or does not comply with the Agreement (including applicable Service Terms and Program Policies)"; that Amazon determines is unsellable or unfulfillable; or "that Amazon determines is otherwise unsuitable." A unit that breaks the anti-counterfeiting policy fits the third item, and the last item leaves the call to Amazon.

Section F-7.2 sets the disposal terms. Amazon may dispose of any Unsuitable Unit, "and you will be deemed to have consented to our action," immediately if it determines that the unit "creates a safety, health, or liability risk," that "you have engaged in fraudulent or illegal activity," or that it has cause to terminate under Section 3 and is exposed to third-party liability. The same clause also allows disposal if you "fail to indicate your removal preference for any Unsuitable Unit," so answer any removal request in the notice as well. Disposal "may be in any manner we deem appropriate (e.g., by selling, donating, or recycling,)," Amazon "may retain any proceeds received," and "you will reimburse us for expenses we incur in connection with any Unsuitable Units."

F-7.2 also contains the one fixed number in this part of the contract, and it belongs to a different situation: 30 days to direct a return or disposal "after we notify you that the Unit has been recalled." That is the recall clock. It is not the deadline for answering an investigation, which the notice sets.

Two more clauses frame the file. F-3.2: "You will not deliver to us any Unsuitable Unit; we may reject any shipment of Your Products." And F-4 says Amazon's confirmed receipt of a delivery does not "indicate or imply that we actually received the number of Units of Your Product(s) specified by you for such shipment." Amazon's own receipt is not your count. Your count comes from your warehouse, which is why the receiving record belongs in the file. How cartons get counted, and what a said-to-contain receipt does and does not prove, is in real counts versus said-to-contain receiving.

What Amazon Documents About the Invoice

Amazon's page on invoice requirements for appealing a policy violation sits next to the investigations policy in Seller Central's Account Health section. It is written for appeals of policy violations, not for inventory investigations in particular, but it is the Amazon page that spells out, item by item, what a supplier invoice must show. It says invoices are required "to verify that sellers are sourcing their products from legitimate suppliers."

• Supplier. "Contact information of your supplier, including a name, phone number, address, and website." Amazon says it won't share this with its retail team or other sellers.
• Date. "A clearly displayed issue date within the past 365 days before the receipt of the performance notification."
• Quantity. Enough "to cover your sales volumes and in-stock inventory for each ASIN cited in the performance notification over the past 365 days," plus sales records for each ASIN.
• Product. Product names, model numbers, or UPC, EAN or ISBN; variation details such as version, color or style matching the listing; and for bundles, every component.
• Format. PDF, JPG, PNG or GIF, "no larger than 10MB."
• Transaction. "The invoice must document a completed and fulfilled transaction."

The page is just as specific about what it rejects: invoices "sent by email or via third-party sharing," because "they must be submitted directly through the Seller Central"; "Sales quotes, pro forma invoices, or any document that is sent in advance of a finalized invoice or completed transaction"; self-issued invoices, or invoices "where the supplier appears to be the same business entity as the buyer"; files in "an editable format such as .xlsx (Excel) or .docx (Word)"; and invoices that are illegible or missing details. You may remove pricing, "but make sure that all other information is visible and clear," and Amazon "might reach out to the supplier to verify." The invoice does not have to be in English.

The Anti-Counterfeiting policy puts the same rule in stronger terms. Sellers agree that "You must provide records about the authenticity of your products if Amazon requests that documentation," and documents "edited in any other way or that are misleading" violate the policy. When appealing enforcement, it says, sellers are "typically required to provide invoices or letters of authorization (LOA)."

The quantity rule is the one that catches volume sellers. One invoice for the last purchase order rarely covers 365 days of sales plus what sits in FBA. The file has to add up across invoices, and the totals have to reconcile with what you sold and what you hold. That reconciliation is covered in three-way inventory reconciliation, and the Amazon side of the count is in the Amazon inventory ledger. For invoices used in an approval request rather than an investigation, see our post on ungating at catalog scale.

For Distributors: Sourcing Requests Reach Back to the Manufacturer

A wholesaler's invoice comes from the distributor it bought from, not from the factory. Amazon's page on responsible sourcing documentation requests says that, for those requests, it may not be enough. Documents there "should demonstrate your product's full supply chain," "should include contact information for the supplier(s) and the original manufacturer," and should be able to trace products to the original manufacturer even when you did not buy from it directly. Amazon adds that this "may require requesting additional invoices or supply chain documentation from your supplier."

That page also counts volume "across all Amazon marketplaces in the last 365 days," lets you remove pricing and highlight the ASINs under review, and says Amazon "may contact suppliers or manufacturers to verify the documents." If the information does not arrive by the applicable deadline, Amazon may remove listings, suspend your ability to add products, or "Withhold any payments due to you."

Other Amazon pages say the same thing in their own words. The Stolen Goods Policy bans products obtained through theft "at any point in the supply chain" and says plainly: "As a seller, you must validate your supply chain." It links to the investigations policy. Amazon's 2025 Trustworthy Shopping Experience Report says Amazon "may verify supply chains, request safety testing information, or perform other checks," and that for products that are more safety sensitive it may require more supply chain documentation "before a seller can list an offer."

The practical step happens before the purchase, not after the notice. If a distributor will not give you the upstream invoice or a manufacturer contact on request, you learn that when you are not under a deadline. We recommend writing the request into the supplier agreement: the right to ask for upstream documentation for any ASIN you list on Amazon, with a response time shorter than any deadline Amazon is likely to give. Supplier screening on the forced labor side follows the same logic, and is in our post on UFLPA supplier screening.

"When Amazon asks where a unit came from, the answer starts with invoices that trace it back to the manufacturer. My advice is to keep the rest of the chain filed next to them: proof of delivery, the warehouse receiving record and the FBA shipment ID. If what Amazon asked for is missing when the deadline comes, the inventory can be disposed of."

Bernardo Campelo, Founder of PrepVia

The File by ASIN, From the Manufacturer to the FBA Shipment

Amazon names the invoice and the upstream trail. It does not name proof of delivery, a warehouse receipt or a shipment ID. Those are our recommendation: they connect the final invoice to the specific units in a fulfillment center, which is what a held inventory actually is. Without them, the invoice proves you bought the product; with them, it shows the units Amazon holds are the units you bought.

File it by ASIN, not by purchase order. A notice cites ASINs, and one PO often feeds several ASINs while one ASIN is fed by several POs. A simple index per ASIN, listing each invoice, the load that carried it, the receipt and the FBA shipments it went into, turns a pile of PDFs into an answer. The mapping from purchase order to FBA shipment ID, and how to capture the bill of lading and proof of delivery while a load moves, is covered in BOL, POD and the FBA paper trail.

Some practical rules keep the file usable under a deadline:

• Final invoices only. Save the supplier's final invoice for the completed transaction as a PDF or image. Pro formas and quotes are useful for buying, not for Amazon.
• Match the listing. The product identifiers on the invoice should match the listing: UPC or model number, plus the variation, and every component for a bundle.
• Do not edit. Remove pricing if you must, and nothing else. A cleaned-up invoice that looks altered is worse than an ugly original.
• Cover the volume. Keep a running total per ASIN of units invoiced in the last 365 days against units sold and units in stock.
• Keep the customs entry. If you import, the customs entry is part of the same story. When the warehouse count and the entry disagree, our post on post-summary corrections covers the customs side; your customs broker handles the filing.

When the Notice Arrives

The investigations policy says the notice comes by email, and the deadline is the one it states. Read it for three things: which ASINs are cited, what is being asked for under identity, authenticity and compliance, and the date. If the request is a responsible sourcing request, Amazon's page says it is answered through Account Health in Seller Central, under Product Compliance Requests and Documentation Requests. Menus move, so follow the link in the notice rather than a saved click path.

• Answer inside Seller Central. The invoice page rejects invoices sent by email or third-party sharing.
• Send what was asked. Identity requests and authenticity requests are different. Identity verification has its own process; if the notice involves a Section 3 action or a video call, see our post on Section 3 video verification, which also covers Account Health Assurance and withheld funds.
• Warn your suppliers. Amazon may contact them. A supplier who does not recognize your company name, or who does not answer, weakens the file.
• Pause new inbounds of the cited ASIN. F-3.2 says you will not deliver Unsuitable Units, and Amazon may reject any shipment. We recommend holding new shipments of that product until the question is answered.
• Plan for the hold to last. The page gives no timeline for the review, and if Amazon finds no violation it "may" release the hold or allow you to request a return. If a return becomes the option, Amazon's Remove inventory overview lists the ways to request a return of inventory from a fulfillment center. Our removal orders guide covers timing and where to send the units.

The policy page does not promise that a complete file releases the inventory, and nothing in this post does either. What the file changes is whether you can answer at all before the deadline. If you cannot, the disposal clause applies.

Where a Prep Center Fits

A prep center sits between the supplier invoice and the FBA shipment, so it holds two links of the chain: the receiving record and the shipment that left its dock. It cannot replace the invoice, it is not your supplier, and it cannot make a document Amazon would accept from someone else. What it can do is make sure the middle of the chain exists and matches the paper on both sides.

Questions worth asking any prep center or 3PL before a notice arrives:

• What does your receiving record show? What arrived against what was expected, per SKU, with discrepancies written down.
• How fast are discrepancies reported? A shortage found weeks later is hard to tie to an invoice.
• Can I see receipts and FBA shipments in one place? The file needs both, by SKU.
• How long are records kept, and can I export them? The invoice window Amazon uses is 365 days.

At PrepVia, receiving and inspection are included, and discrepancies are reported within 24 hours of arrival, with photos. Our app shows expected versus received units, with discrepancy alerts and status timelines, and inbound shipments to Amazon are created through Amazon's SP-API, so the receipt and the FBA shipment show up in the same PrepVia app account. Our AI reads your invoices and packing slips for SKU, UPC, name and quantity, and you check the list before anything is saved.

None of that guarantees a release by Amazon, and PrepVia does not offer lot-level recall tracking. If Amazon allows you to request a return of held units, PrepVia offers removal order receiving. The supplier invoices and the upstream trail remain yours to keep.

Frequently Asked Questions

What is Amazon's Unsuitable inventory investigations policy?

It is the Seller Central policy that lets Amazon withhold some or all of a seller's FBA inventory while it investigates suspected violations of its anti-counterfeit and restricted products policies, request information about identity, product authenticity and legal compliance, and dispose of the inventory if the information does not arrive by the stated deadline. It is tied to section F-7 of the FBA Service Terms.

How many days does Amazon give to respond?

The policy page does not give a number. It refers to "the stated deadlines," which are set in the notice. The 30 days in section F-7.2 apply to recalled units, not to investigations.

What should a supplier invoice show?

Amazon's invoice requirements page for policy appeals, the closest list Amazon publishes, asks for the supplier's name, phone number, address and website, an issue date within 365 days before the notification, product identifiers matching the listing, and enough quantity to cover sales and in-stock inventory for each cited ASIN over 365 days. It must document a completed transaction and be a PDF or image file no larger than 10MB.

Is an invoice from my distributor enough?

Not always. For a responsible sourcing documentation request, Amazon's page says documents should trace products to the original manufacturer even if you did not buy from it directly, which may mean getting more invoices or supply chain documentation from your supplier.

Can I email the invoices or send a pro forma?

No. Amazon's invoice page says invoices sent by email or third-party sharing are not accepted and must be submitted through Seller Central, and it rejects quotes, pro forma invoices, self-issued invoices and editable files such as Excel or Word.

Does Amazon ask for proof of delivery or a warehouse receipt?

Not on the pages we checked. We recommend keeping them, with the FBA shipment ID, because they connect the invoice to the specific units Amazon is holding.

If my documents are accepted, is the inventory released?

Not automatically. The policy says that if Amazon determines the inventory did not violate the policy, it may release the hold or allow you to request that the inventory be returned.

Final Take

The Unsuitable inventory investigations policy gives Amazon three powers: hold the stock, ask for proof, and dispose of the units if the proof does not come in time. The page names no document, but Amazon's invoice and sourcing pages do, and together they ask for final, unaltered invoices for completed transactions, traced back to the manufacturer and covering a year of sales and stock for each cited ASIN.

Build that file before anyone asks, by ASIN, and add the links Amazon does not name: delivery, receiving and the FBA shipment. Under a deadline set by someone else, you send the file you already have.