In the time period in question there was a guy running a cocaine smuggling outfit out of central Penna.. He hired laid off airline pilots, and paid them $500,000 per trip. AFTER they completed the second trip, they were paid for the first, etc,. paid in hundreds in airtight aluminum suitcases. They used Cessna 310's stripped , added fuel capacity and carried a metric tonne or two of refined cocaine.
Eventually, the lot were caught and jailed. I think the "mastermind" is in for life, and two the pilots rolled over on him when caught returning. They pilots were on a radio show one early morning, when I was in the garage rebulding the engine of my Formula Ford, talking about everything that went on.
Their bottom line advice was if you're going to smuggle cocaine, when the busts come doiwn, be among the very FIRST caught, that way you can roll over on someone else and get minimal jail time with your "deal" with the authorities.
My best guess is that this money is somehow related to that operartion. Either the guy's a minor participant, or wound up with a home that a pilot had and stumbled across the stach while the pilot was in the slam.