If I ever have to bring something back I don't even need a bill or anything. They either look in their data bank or just look at label and say sure, "will that be ...cash or credit on your Amex?".
BTW, the pharmacy part is awesome. In Canada, prescription fees can be as high as $16.99 or more but at Costco it is a mere $4.99 and they have the best generic brands at a fraction of the cost of known brands.
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