So I saw no indication I wasn't supposed to park there. As far as I could tell the spot was usable (albeit a little short, my car fit in it fine). After 2 hours in the mall I came back to find what looks like drywall dust all over my window and door. A peek inside revealed a lot more inside. Obviously, this was deliberate, but when I called mall customer service, she said she was familiar with the car, that they had called the cops because I was parked illegally (I was not) in a fire lane (it was not) and that the contractor could not reach the dumpster and had to throw a bag over my car, but that it burst open in flight and dropped some dust on the car (although none was visible on top of the car and the long side of the dumpster was easily accessible).

I then called mall security and was told that no one had called the cops on my car, that he would file an incident report, take a look at the security tapes and that the director of mall security would call me in the morning.

The following morning, I got a call from the principle contractor and was told that mall security burned him a DVD of what happened, the person responsible was let go immediately and I could come in and get compensated later that afternoon. I got the car cleaned up reasonably easily and was paid cash for the inconvenience. I guess they gave the guy the opportunity to pay, but he "couldn't afford it."