At the online retailers I've worked at (not Amazon) returned items get split into a small number of groups.

A person returns a $5000 RTX 5090? A manager will be paged, who will carry it over to the high value items cage, in full view of the CCTV.

A person who returns a $5 bike light? And that person has also spent $$$$ over the years with a 0.5% return rate? Straight on the pallet of mixed returns without even opening the package.

Medium-value returns and customers with an eyebrow-raising return rate get a medium amount of inspection.