Were you in the centennial parking lot? They have cameras back there that cover parts of it. Call the school police and bug them to watch the tapes. The detectives stay kind of bored and will actually do stuff. It is also a good idea to have a report on file just in case you run across it or something else happens in the future. I would normally blame the local crack heads but they try to go for stuff that looks like scrap as the local metal yard knows which ones to check up on.