A gift receipt is a generic barcode. It doesn't say how much you paid or how many items are on the gift receipt. If someone returns an item with a gift receipt, the barcode is scanned and the item is scanned and if that item or items are on the gift receipt it offers a refund of the purchase price in the form of a target gift card. A gift receipt with 30 other items would look identical to one with only the gift item on it.