[tedownyiskinm]

I think it depends on what the customer says is the reason for a return. If its a simple case of not right or no longer needed it will be sent for grading and may end up on Amazon warehouse deals. If claimed its faulty i would assume its then sold into pallet loads of random items.

I dont think Amazon have the man power or facilities to test all the different kinds of items that get send back.

I buy Amazon returns from a public auction that buy pallet loads and i often see graphics cards that clearly dont match the box.