Yes, you can.
Yes they can look up the receipt either that or they will let you exchange them
Yes, they usually give a store credit on like a credit card.
Yes. If its on sale, youll get the sale price
Yes
Typically you will have a gift card issued for the amount the product currently sells for. You will need ID and you're only allowed 3 refunds with out a receipt. Depending on the condition of the product you shouldn't have a problem.
As long as the tags are still on
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