I'd assume the policies follow the procedures dictated by law and by competition. In any department store, I can find garments that have been purchased, returned, and returned to the sales racks. State laws prohibit resale of some items. so other arrangements need to be made for those items - beauty, pharmaceutical, undergarments, etc.
I do wish all employees made a sincere effort to follow company policies regarding checking returns, but they don't. Not in brick and mortar stores and not in the more anonymous warehouses such as QVC, Amazon, etc.