My question involves a consumer law issue in the State of: Maine

Here is my situation, a friend was helping me move out of my old apartment, we had unloaded most of my stuff to my new residence. He was going to go back and forth to keep moving things while i was at work that week. At some point in the week he got into an accident while my stuff was in the car, he took it to the auto place (where he had leased it from) and they are repairing it but wont let him have it or its contents till the car car is paid off. I understand the car and most contents being held, but as some of them are not his property can they be held? It looks like they are in possession of good that do not belong to them so that means they have no right to have them and must return them. Can they hold them or can i order them to return my stuff? Do i need any court based legal documents or anything?

Any help is appreciated.