I did a similar thing in San Francisco when working at the ballpark.

Someone smashed my window, and someone stole my radio. (I knew the cops wouldn't do anything besides laugh.)

Didn't care about the radio, but that window bothered me.

I decided to keep the doors unlocked, and carried a portable radio to work. (Too cheap to pay for parking.)

I put a sign on the rear window, "Please go ahead and sit in the truck, or sleep in the bed, but Don't Break Anything. Everything is unlocked."

It was an old Toyota, and it had a kill switch hidden.

Never had a problem again.

There were days when I would find cash in the glove box. I don't think it was tip. I think my truck was being used as a drug drop, but didn't care.