Chill. In all likelihood, you'll either find it soon or it'll be at School. If you don't, there's nothing you can do about it-worrying will solve nothing.
I ended up asking him for five minutes if it was the Bunny Apocalypse.
Edit: Okay this makes no sense... I mean he's neutered from what I was told. This isn't a new environment for him, and he lives with a Rottweiler and has endured a hurricane before... None of answers from Google explain why he keeps thumping his feet.