Sorry about the loss of your book.
Before you kick anybody in the shins though, I was wondering-
You mention you bought an aviation book which subsequently went missing, right?
Can you describe the aviation book? Was it a rather rare title around your flight school, say something to do with aviation history, or an autobiography of someone lesser known?
Or was it some rather generic and common book, one that many instructors and/or students at your school would have? "Instrument Flight Theory" or something like that? Or some kind of manual for commonly used nav equipment or aircraft at your school?
Basically what I'm getting at here is maybe another student or instructor picked up a common book around your school (yours) but thought it was theirs? If so, I probably would not kick anybody in the shins, or spread bad blood around with accusations that are not provable probably.
Again, was your name on it if it was a common book around there?
Anyway, good luck finding your book.