At that time, all-in-one card had not been realized at school, and the meal card and water card were separated, so there were so many cards in universities, including water cards, meal cards, library cards, bank cards and membership cards in Internet cafes. So it's normal for someone to find a card at school. I picked up several meal cards and water cards in the university and handed them directly to the broadcasting room of the Political Affairs Office. Then let them broadcast who dropped the card.