In-store return with a weird receipt: how I checked it

This happened to me in a real-life situation while supporting the register during a return with a long line. The problem was that the receipt looked valid, but the POS couldn't find the original sale. At first, it didn't seem serious, but in a real work environment, that kind of detail can affect times, costs, or customer trust. I didn't settle for the first explanation. I checked the payment…