OK, I feel like such a fool. I was parked at work (well I thought I had the car in park) but I was in fact rolling back into the other car. As I was packing my bag to get out of the car I bumped the car behind me. No damage to his car (since all I hit was his license plate in the front) but my black bumper has scratches, and imprints of the bolts that held his license plate on. I have a 3M guard on the bumper (so the scratches are minimal) but now I have these indentations on my rear bumper. Any ideas of my options???