Having been a customer in this exchange, it looks like all Amazon systems. Amazon sold goods seem to be eligible - All? I'm not sure but that's handled by Amazo

Having been a customer in this exchange, it looks like all Amazon systems. Amazon sold goods seem to be eligible - All? I'm not sure but that's handled by Amazon, so no load on Khol's and everything is shipped back to Amazon - presumably in bulk so as to save on shipping/packaging materials and labor.