I have had my stereo stuff stolen 3 times. One night they stole it out of both my cars at the same time and they are kept in the back garden. They stole everything, amps, subs etc, I had left the boot open on both though . Then the next day I got cctv and set it up pointing at both the cars. About a week later my girlfriend had gone out in the morn to walk the dog and came back in saying it felt like someone had been in her car, nothing had been stolen but a few things had been moved. So I rewound the cctv tape and at about 4:00am there is some guy that jumps over the gate, walks up to my car and checks all the doors etc and has a good look through the window of the car, then goes and checks my gfs care and she had left the boot open so he climbs in and starts having a good root around for about 10 mins then comes out with my old coat and a box full of junk that was in her boot with some old trainers of mine in Then he goes back over the gate but about 5 mins later comes back with my old trainers on and has another root around then goes off again.
I havent had anymore probs after that because I always double double check everythings locked now and if they had to smash a window the dog would go mad, if someone was out there though I don't know what would be best to do as u dont know what they are carrying knives, needles etc and car stereos can be replaced.

Dan