I don't know why people do half the stuff they do, but stupid people will do anything. 99% of it never makes any sense to me. Maybe they thought there would be a big deal and it would be in the news and they could sit back and laugh. Maybe someone bought them and put them in them at home and forgot about them when they returned them. I don't know, I can't come up with any other reasons. My son said he didn't know where they came from and that he didn't pick them up on the bus. I would much rather it be a prank then that some other kid took them to school and lost them on the bus or put them in