Missing Item

It has happened again. I am missing an item from the supermarket. I know I put it onto the conveyor belt to be checked out but it did not come home with me. I cannot locate the receipt so I do not know if I paid for it or it became part of the next person's order. I checked my car trunk to see if it got out of the bag, but it did not. I really wanted that item. I even went back to the aisle to get it at the end of shopping. It was not a necessary item, it was one that I wanted to try for the first time. If I find the receipt and I did pay for it, I will go back to the store and ask for another one.