Seems to me the money should be turned over to Nash family. I once left a Perazzi skeet gun on a picnic table at a range, realised that, turned the car round, headed back and found a guy taking it to his car. Instead of taking the gun to the office and handing it in, which is what I would have done. Supposing, 20 years later my gun shows up at a Julia auction and is sold for $100,000. Is finders keepers OK with a gun that can be traced easily. Don't think so, And the seller wept, hell it was never his gun!!
Mike