Heebie Jeebies part 2

Last night I found a notebook left behind by a customer. Pretty standard stuff except that the notebook has my last name on it. not my last name exactly, the o is replaced with an a. Still very freaky. Well my last name is not that common, in fact I've never known anyone with my last name as it is a shortened version of my original last name that my mom changed when we became US citizens. So why is it on this notebook in big letters? I don't know. It's in scary child like serial killer handwriting. It says 'xxxx (last name left out for my protection) leatr books and braning" doesn't mean anything to me except that my last name is on there twice and it was left behind in my bookstore. Coincidence? I'm not sure. I hope so. Inside there is a studnet info sheet with the students name on it and her social security number. On the first few pages there is some diagram of about 30 instructors names with a six digit number under each of their names. At first I thought it was all of their extension but at second glance they are not extensions. It's set up like a family tree diagram with one name on top of a triangle. On the next couple of pages are names I don't recognize and phone numbers, all from out of state, all different area codes. Kristian thinks it belongs to the custodian who's mentally challenged but I don't agree. He never says a word and is all around behavior doesn't make sense. He doesn't seem focused enough to find out what my last name is and then write it down. Now I'm a hunt for the perp!