Riddle me this

Jared took his lunch to school in his lunch "box". He ate lunch, then put the empty lunch box in the lunch tub (each classroom has a tub in the lunchroom where the kids put their empty lunch boxes before heading out to recess from the lunch room. Kids from each class are assigned to take the lunch tub back to the classroom, where at the end of the day, each kid digs through and find their lunch box to put in their backpacks to bring back home again). At the end of the day, his lunch box wasn't in the tub. It's also not still in the lunchroom, nor is it in the lost and found bins. It's not in his classroom, and none of the other teachers have reported finding a random lunch box in THEIR lunch tubs. So just where did the lunch bag go? The bins are clearly marked, so there's not much chance he put it in the wrong bin by accident (and a teacher would have discovered a random lunch bag at the end of the day even if he HAD). His name was clearly printed on the back, so not much chance there was confusion as to who it belonged to. It appears to have simply VANISHED. J is pretty upset as it was the special one he picked out over the summer from The Children's Place to be his Kindergarten lunch box/bag. Now he's stuck using an old one from PRESCHOOL (the shame!) until we either find it or can replace it with something he'll be excited about. UGH!