As paper receipts disintegrate, some people are a bit wistful. Chris Otto runs a Web site called Papergreat, which analyzes abandoned bits of paper including old receipts, like a 1907 receipt from L.B. Hantz, a repairman in York, Pa., that included detailed drawings of a furnace and a stove.
“It’s going to make it interesting for future historians,” said Mr. Otto, who has kept the receipt for the first meal he bought the woman who is now his wife — a hot dog at a Sheetz convenience store. “They’re going to have to be more into the computer forensics things if they want to find out what people spent money on, and how they lived.”