Another Point of Sale fraud method

Just when I thought, we had discovered every type of POS fraud, today we discovered a new one.

Most people when they buy something in the shop do not bother to take the receipt, those that do often just throw them away. Now if you use discount vouchers, these receipts contains dollar discounts which in a large transaction can be a few dollars or a decent discount% for use the next time. What happened was a clever staff member collected these receipts and redeemed them but did not give the customer the discount. They were only discovered when a customer came to return an item, claiming that they had not picked up the receipt and the owner discovered that the discount on receipt had been claimed.

No-one knows how many of these discounts have been falsely claimed, but it appears quite a lot.