dude that same exact thing happend to me the 2nd time my Z was in a hit and run. First time i caught the person but cops wouldnt do anything. The 2nd time it looked like someone was pulling into a parking spot next to me on my left side and took the left/rear corner of my bumper and took the paint off of it.
Hard to see but u can see the black marks where it went right past the primer
Would have cost me $2300 to fix but i took the 2 hit and runs and my gf smashing the car into my bike as a sign and sold the car and never fixed it.