Pre-FBA Product Inspection: What a Prep Center Checks Before Units Ship to Amazon
Inspection levels, unit-level checks, defect handling and the reference specs a prep center needs to catch supplier problems before inventory ships to Amazon.
Most sellers think of an FBA prep center as a labeling station: put FNSKU stickers on units, poly-bag what needs bagging, build the cartons, ship them to Amazon. But the step before labeling is usually where the most problems are caught: opening the supplier's cartons and checking what actually arrived.
A problem caught at the prep center costs a re-label, a re-pack or a supplier claim. The same problem caught after Amazon receives the shipment shows up as stranded inventory, receiving discrepancies, or customer returns with "not as described" reasons. This article explains what pre-FBA product inspection covers, how deep it should go, and what to send your prep center so the checks match your product.
Why inspect before units go to Amazon
Factory shipments carry predictable errors:
- Quantity short or over compared with the purchase order or packing list.
- Mixed variations in one master carton, like the wrong color or size packed with the right one.
- Transit damage, such as crushed retail boxes, broken seals or leaking liquids.
- Packaging that won't pass prep requirements, like poly bags without suffocation warnings or loose sets that aren't bundled.
- Barcodes that will confuse Amazon's scanners, for example a visible UPC on a unit that needs an FNSKU, with nothing covering it.
None of these fix themselves between the warehouse and Amazon. Once units are labeled and boxed, every one of them is harder to find.
Three levels of inspection
Not every shipment needs every unit opened. A prep center should offer levels, and you should choose based on supplier history and product risk.
| Level | What's checked | Typical fit |
|---|---|---|
| Count and carton check | Master carton count, visible carton damage, case-pack quantity against the packing list | Repeat orders from a proven supplier |
| Sample inspection | A defined sample of units opened and checked against your spec | New supplier, new SKU, or a past quality issue |
| Full unit inspection | Every unit opened, checked, and repacked if needed | High-value items, fragile goods, or a shipment with known problems |
For sampling, many sellers use an acceptance-sampling table such as ANSI/ASQ Z1.4. It sets how many units to pull from a lot of a given size and how many defects are acceptable before the whole lot is escalated. If you have an agreed standard with your factory, give the prep center the same one so both sides measure the same way.
What a unit-level check covers
When units are opened, a useful inspection checklist covers:
- Identity. Right product, right variation, right quantity per retail pack.
- Condition. No cracks, scratches, stains, missing parts or broken seals.
- Packaging. Retail box intact, poly bags meet thickness and warning requirements, sets held together.
- Barcodes. Existing barcodes either match the FBA listing setup or get covered by the FNSKU label. FNSKU labeling rules and placement explain which situations need a cover label.
- Dates and lots. For dated products, expiration dates are readable and far enough out for Amazon's requirements.
- Inserts and accessories. Manuals, chargers and small parts are present where the listing says they are.
What happens to defects
Inspection is only useful if the result is handled consistently. Before the first shipment arrives, agree on:
- Quarantine. Defective units are set aside on hold and kept out of FBA cartons.
- Evidence. Photos of each defect type, the carton it came from and the lot code, if any. Your supplier claim depends on this.
- A written report. Counts by defect type per SKU, so you can see whether the problem is one carton or the whole lot.
- A decision path. Rework (re-bag, re-box, re-label), return to supplier, liquidate, or dispose. Agree on who makes the call and how fast.
What to send your prep center
Inspection is only as good as the reference it's checked against. Before inbound, send:
- A spec sheet per SKU: dimensions, weight, components, packaging type.
- "Golden sample" photos showing what a correct unit and retail pack look like.
- The purchase order and supplier packing list.
- Your defect definitions: what counts as cosmetic and acceptable, and what doesn't.
- The inspection level you want for this shipment.
Building inspection into a repeatable workflow is part of a broader FBA prep process that doesn't get rejected. Inspection is the first step in that chain, before any label goes on.
IDCEA offers FBA prep services in Southern California, including receiving import freight, product inspection at the level you choose, FNSKU labeling, bagging and bundling, and building Amazon-ready cartons. Send us your SKU specs and supplier history, and we'll suggest an inspection level for your next inbound.