Overview

Amazon automatically assigns preparation requirements to every SKU that sellers send to its fulfillment centers via FBA. When those requirements do not match a product’s actual packaging needs, sellers can submit a formal investigation request through Seller Central. The process helps avoid unnecessary prep costs, prevents shipment delays, and ensures that Amazon’s system reflects the true characteristics of each item.

Key Points

• Product‑specific rules — Amazon determines prep needs based on attributes such as size, weight, fragility, and material; the guidance appears while you build an inbound shipment.
• Dispute option exists — Sellers who spot a mismatch can launch an investigation request directly from the prep tab in the shipment workflow.
• Review official guidelines first — Amazon expects sellers to consult the published packaging and prep standards before filing; unsupported requests may be deprioritized.
• 90‑day cooldown — After a request is submitted for a particular SKU, the same product cannot be re‑submitted for another investigation for 90 days.
• Four‑business‑day response window — Amazon aims to reply to each investigation within four business days of receipt.
• Performance alerts tied to prep — Incorrect or missing prep triggers inbound alerts that can lead to fees or delayed receipt of inventory.

How the Investigation Process Works

1. Identify the discrepancy — While creating an FBA shipment, the prep tab shows the required handling (e.g., “bubble‑wrap and polybag”). If you sell a sturdy glass vase that only needs a polybag, note the extra bubble‑wrap requirement.
2. Flag the issue — Click the “Request Investigation” button next to the problematic SKU. A pop‑up form appears where you must describe why the assigned prep is inaccurate.
3. Provide photographic proof — Upload clear images of the product packaged according to your own method, ensuring the barcode is visible and scannable. For example, photograph the vase in a single polybag with the barcode facing outward.