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Receipts have a time stamp, so they’d have a record of the actual price you paid. If you paid in cash and didn’t get a receipt, and if they make an exception for your return, they’d base it on when you said you bought it. You might be able to get one or two exceptions depending on who’s working. With that said you’d better make a purchase of thousands of dollars and pay in cash to make sure to get at least a few dollars back for your efforts.
Now imagine working for two hours and then having to eat a Big Mac.