I got rear ended, broke a couple of the bolts which held the bumper, the middle two of six, and scuffed the paint. Got out, realised it was someone I knew who had driven into me, laughed about it, he kept trying to convince me to get it fixed at his expense but I really couldn’t care so we left it at that.
Another one, I was on the bike, got taken out by someone who turned without signalling as I was passing stationary traffic he’d got bored of sitting in. I took his mirror off and hit the ground, unharmed. His fault, his damage so we agreed to leave it at that.
For minor stuff like that I wouldn’t bother. No come back from either.
However, I was a witness to a rear end shunt, very low speed, shouting match followed and then the offending driver drove off without giving details. I volunteered my details as a witness and had her numberplate number. It went to court for leaving the scene. Found out later she’d done £800 of damage, some fancy parking sensors in his bumper. Anyway, don’t just leave without agreeing to do so with the other person!