My car got stolen too last week, and let me tell you yes it is easy to steal cars especially integra and civics. Locking your door doesn't make a difference. What you have to do is put a kill switch or an alarm, a clutch lock and those locks that goes on the steering wheel. My cousin uses all those on his b16 civic. What i think they did is they either opened it with like a master key or they just cracked it. Don't sleep on your car when you find it put all those things, stealing an integra is like taking candy from a baby. Hey you never know you will probably find it with the books inside. If not tell your teachers and see if they can give you another book.Hope you find it!