I once bought two Minolta lenses from a guy who said they had an overage at the warehouse. I actually thought he was telling the truth until I thought about it.
Did you buy the lenses in the Minolta parking lot out of his van?
Often, people will buy video game systems or other electronics out of a van only to get it home and find the box contains gravel or scrap metal (ballast to account for the missing product). You seemed to have done business with an "honest thief."