Emily-chan found it!
After Tash-san killed all of the typos, Emily-chan asked me where I found Tom-kun’s tooth. So I told her – and she opened up this whole room! Apparently there were a bunch of imps that were stealing stuff, and they were all stashed in the room.
The room is next to the piano under the fourth corridor, the one next to the Librarian’s office. So if you guys want to pick up anything that was stolen (we got rid of the imps) you can go check.
Not everything that was stolen was there though; I found Jess-chan’s key and Tyler-kun’s wall, but we couldn’t find Tash-san’s plushie or my Elfen Lied postcard. We asked Tash-san, and she said it was just the Society being itself.