$100 reward for a Stradivarius...

[Acer]

How can you fence a $4 million violin anyway? Like trying to pawn a Picasso. Most of the worth is in the uniqueness of the instrument, and the whereabouts and history of every Strad are well known. Might as will give it back, priceless is the same as worthless in this case.

Now, if he'd left a wad $20's behind and the taxi driver tracked him down to gave it back, THEN you'd have a case of real honesty.