I really disliked eating anything that was packed in a metal lunch box - has a certain smell about it . It was usually peanut butter and jelly wrapped in wax paper. No cafeteria at our elementary school.
LIbrary Cards looked just like this. You got to sign your name on it. If it was a school library book, you would look up and down the names of the people who'd taken it out before you, to see if you knew anyone!