While he as surveying the house trying to estimate how many cubic yards were involved his wife picked up a National Geographic off a stack and started thumbing through it. She found 20 dollars in Silver Certificates between the pages,
Similar story. When I was in grad school a buddy was living in his future MILs mothers house. Seems the old man died and they moved the grandma into a nursing home. My friend needed a place to stay (just out of the army.) So the deal was he needed to clean the house up and throw away everything. His future MIL and her sister had already looted all the silverware and jewelry. Nothing left but junk from the 1930s on. And the family had already been at war over the inheritance for a couple of years. Hence the vanishing jewelry and silver.
So I was kind of handicapped. I had a several months old son, and my wife worked 2nd shift as a nurse. I just picked up the kid and went visiting. Babies sleep most of the time anyhow. As we were boxing up books to toss out (none interesting titles), I opened one and found a $20 bill inside. I said "Hey Ralphie, look at this". He was shocked, then upset. So we had to unbox all the books and go through them, finding untold amounts of cash. So the clean up procedure changed dramatically.
And he had a problem (I didn't.) I had no claim to any of it, I was just helping out a buddy. We split a 6 pack and discussed it. Because I was a law student, he figured I had some kind of moral compass. I had to explain that law schools selected their students because of a lack of morality!

His problem was who to tell, or if he should tell anyone. I never knew (or wanted to know) what the total he found was. I know it was well over $15,000. But had he told his fiancee, she'd have been torn on if she should tell her mother. We already had strong indications of her proclivity toward pocketing things she'd found.
My guess was always that Ralph just pocketed the cash and spent it on them in the future. I've never asked him, and I don't think I want to know. At this point it would just cause trouble.