What should the claimant do regarding a financial claim resulting from a traffic accident when the accident file has been damaged at the traffic department, and nothing is known about the other party, who is a non-Muslim?

The remainder of the car repair cost must be returned to the owner of the money who caused the accident and who paid the six thousand instead of his share of the damage, and the remaining amount is one thousand five hundred. If you exert your utmost effort to search for him and do not find him, then donate the money to charitable causes. If he or his heirs appear later, give him the choice between approving your action or returning the amount to him.