Why?

Why would a kid steal a lunch box that they can't take back to school. Yesterday someone stole my youngest son's lunch box,a 1998 metal Godzilla lunch box. There is no way they could get away with carrying it. The school is looking for it like it was a flawless 10 carat diamond. I am posting reward posters because there isn't another one on eBay. So it must not exist.