I think its all b*****ks, they blatently waited until you were gone then thought they would take for a spin then crashed! Then made up the story they was taking it back to you. How did they know you was gunno be in? Why wouldnt they ring before leaving to bring the car to you? If you left your car to have it sign written/wrapped then come back to it smashed up, you would call the police wouldnt you? So why not now just because its a wheel refurb place. I bet any money it wasnt just him in the car at the time of the accident. Have you even found out if there actually was an accident before he crashed as hes excuss of swirving into a wall? Was the road even on the way to yours?
All sounds a bit strange to me....