Not to mention that on E-BAY you can get more than "face" for those old silver certificates. No, I'd have "made a deal" with the builder.
Oh, during the prohabition era, dairy farms were used to store alch.in the milk tanks. The farmers were paid a rental fee, and it was often stored in those 5 gal milk cans, then burried by the farmers so they'd not have to explain tens of thousands in cash in the house if the storage was ever discovered. It was dug up a bit at a time after as it was needed. A lot of it is still out there, underground as the farmers died, became senile, etc..
Off shore in Wainscott LI NY about 200 years ago, a ship went on the outer bar here. And was abandoned by the pirate crew. A few locals went out and discovered THOUSANDS AND THOUSANDS of silver Spanish dubloons. Before a storm cqame up and smashed the ship to bits, a very large portion on the silver was salvaged. These families,while not "rich" thereafter remained farmers, but what we'd call "hobby" farmers. Yes, ther sort of worked the land, but never really workled all THAT hard for a couple of centuries. Today they ARE rich because that land they hobby farmed went from $1 an acre to $750,000 and more an acre, it is not what you know, who you know , but are you a member of the "lucky sperm club"/ that matters.