Check fit with the actual product
Use the product you intend to ship, including any wrapping, caps or accessories. Confirm that it sits in the intended orientation and that the insert leaves enough room for removal. Check that the box closes cleanly without putting pressure on the contents.
Try assembly more than once
Fold, fill and close the package several times. Look for awkward tabs, unclear folds or extra packing steps. Ask the supplier which tolerances to expect in production. Note whether the sample uses the proposed material and construction or is only intended to demonstrate the structure.
Record approvals and open questions
Check text, artwork orientation and the placement of information near seams and folds. A plain structural sample cannot establish the final printed color or finish. Record what you approve and request clarification on anything the sample cannot demonstrate before approving production.