Sad thing is, seems there are more people who will damage your car then leave without so much as a note than people who will own up to their mistake...
When I was 16, I was involved in an at-fault collision with a parked car (slid sideways on a gravel road and damaged the fender on a parked car) and I immediately stopped, got out of my truck, and knocked on the guy's door. Since I was honest with the guy, we settled on me paying for a new fender and parking lamp, and he didn't bother turning me in. He even said he didn't even hear the collision. Had I not stopped, he'd not have known his car was hit until at LEAST the next day.
Honesty is the best policy.