Man, that sucks. I've had the same thing happen to me, multiple times. Someone took out my drivers side rear door and quarter panel in a parking lot. Side-swiped while I was in college and had to report that, too. I've also been bumped by someone which left a gouge in the bumper. The thing is, you won't ever find the guy
Just report it, get it fixed, and be pissed off for the entire next year or so.
You could always turn it into another project car!
More importantly, the American Legion hosts a BREAKFAST sponsored by Coors Light?? Too bad its ****ty beer.