That is very strange.
Sometimes when I have a false awakening but am not completely lucid, I will do things in my dream and when I wake up later my mind doesnt realize that there was a difference. So say in my dream my friend asked me if he could borrow a guitar pick and I give it to him, I will later wake up and ask him for my guitar pick back and he will think I am crazy cause I havent seen him in a week. To my mind though it was yesterday, and the only way that I know it was a dream was cause it just must have been.
So maybe I didnt quite understand your story, but is it at all possible that your car is fine and the mechanics are really confused? and that bank paper is lying on your counter somewhere?