True. Thats why everyone is gearing up with dashcams these days. Solid proof is a minimum for the police to entertain your case these days.
Get a dashcam that’s hooked up to ur battery so it records when the car is off as well.
Also mate, let it go. Take the scratch as a lesson and move on. I’ve been down the same road and nobody will chase this fellow down. It’s not worth the trouble. Karma will get him one day.