Sorry to hear about that, it's such a violation to have something like that happen.
I used to leave my car unlocked so thieves wouldn't break the window to get in and find out there was nothing in there. Then I became afraid people would think it was abandoned and start using it as a place to put their garbage. When I left it unlocked, the neighborhood kids tried to steal my radio, but that neighborhood was so backwards that they didn't know how to remove the radio. They took off the knobs and were stymied because the radio was mounted from the back.