I knew two persons meet the same situation as well. First one, she left her contact address and phone number because it is illegal to crash other's car and don't tell them, maybe she will be charged. The owner phoned her and asked her what happened. She told him the truth, the owner said that it is not too serious so the case is close. Second one, he crashed other's car but he didn't leave any message and just went to work. The owner found him and said that he will sue him. Finally, they found the owner parked the wrong place so he was not charged. But he still knew the insurance will cover the fee in the parking crash. So I suggest that you should leave message.