My AR was stolen from my car!!?

I know i can report it, what kinds of things do the cops do to try and retrieve it? do they ask people if they saw anything, check for fingerprints, surveilance cameras. i was parked in the back of a parking lot, so its not really gonna be a visible place. (no parking anywhere else) i REALLY want this rifle back, ive spent over $1200 on it so far!!! any information helps. do they just fill a report? or do they actually try and get it back, its fully California legal and registered, all that stuff.....