My step-grandfather was raised in a Prohibition-era moonshine camp along some river, I believe around southwest Ohio. I do not know the name of the river, and would hate to guess. It might be the Miami river? I do not think that it was the Ohio river. Anyway, he was illiterate, and had to check traps, and fish, and hunt, pretty much everyday, to help put food on the dinner plate.
When his father was on his deathbed, in the late 1970's, he ordered his son (my step grand-father) out of the hospital room. My grandfather was quite upset at being made to leave his father's presence. Once he was gone, his father told his wife where he had buried a number of mason jars, in front of their mobile home, in Ohio. The mason jars contained about $7000 dollars cash. Immediately after his death, the family dug the money up.
I do not know whether this happens more often then we might think. I also do not know whether this was because of their background. My grandfather was an expert hunter, fisher, and trapper. But, it was not because he "enjoyed" it so much as he had to do it every single day, as a kid, probably instead of going to school and learning to read.
Also, I remember he shared an incident that involved a suspected federal(?) agent showing up in the community, I guess looking for illegal bootleggers. Apparently, the fellow was in some sort of restaurant. And, someone passed the waitress a gun. And, that was the end of the agent. He related this incident in a very matter of fact manner. I don't think that he was kidding around. Also, he never seemed to show any contempt for the government, in any other instance, that I can recall.
Aside from raising animals, and farming massive amounts of vegetables on his land, my grandfather grew grapes, and was quite good at making wine, in old wooden barrels. He made both grape wine, and dandelion wine, every year. Even when I was a kid, under the age of twelve, he saw no harm in giving me wine to drink. He even gave me a gallon of wine to take home. But, it eventually turned sour.
Anyway, if people have doubts about these cache stories, I can confirm that there was a cache(s) buried, and then recovered, prior to death, in my stepmother's family. Also, if my grandfather's father had died suddenly, I am fairly certain that no one would have ever known that the jars were buried in front of the trailer, in the yard.
Also, I would really like to know whether the moonshiners had a history of burying their profits, rather than depositing them in a bank account. If so, then it might be worth researching where moonshiners were previously busted, and then searching their old haunts for buried caches.