We have a hole in our wall that just calls to our kids. It must be so irresistible. It's the intake vent in the hallway. Its big, and kid height, and has lots of slots.
A socket wrench and an hour later, I was looking inside the hole in the wall for the first time. It was amazing the treasures it held! (aside from the furry dust....I don't even want to think about that...)
And there it was. Carly had shoved it into the wall.
So from now on, whenever something is missing, we may just look in the wall first!