Similar issue at our version of the DMV, the Traffic Department.

Had to provide proof of address and the only thing I had was the rental agreement with my landlord. But the copy I had was signed by me, but not countersigned by my landlord.

The clerk didn't want to accept it. I told him I could just walk out and fake a signature. He said that's OK and that he isn't a policeman. So I countersigned it in front of him. He paused and then accepted it.