FOUND: $642K and gold behind a water heater

[Jim K.]

Hi, I recently bought a free-and-clear house at the local tax auction for $25K, When I claimed it, the former owner had left everything in place and it needed a cleanout. So my guys were down to the basement and looked behind the water heater. They found a cavity in the foundation with the cash mentioned in used twenty-dollar bills with random serial numbers wrapped in opaque plastic food wrap, and a sealed Home Depot Homer bucket behind it. The bucket was halfway filled with South African Krugerrands and American Eagle gold coins. On top of everything was a plastic sleeve with an old-timey baseball card in it of some dude named Joe Doyle. I'm just lucky my guys called me before they threw the bucket and the bundle away.

I have no expertise in this sort of thing and don't know how I should invest this unexpected windfall. Can anyone help me deal with this?