In regards to 1964 having been not that long ago, how many houses have you ever seen that have been vacant for 46 or more consecutive years. Plus not only would the house have to have been vacant, but it would have to have been pretty much untouched, meaning no next of kin would have entered the house which in and of itself is highly unlikely. Sure, if something were destroyed by a flood, I suppose money could have ended up in a river and maybe even eventually on the ocean floor, though chances are it probably would have washed up on a beach somewhere and someone with a metal detector or just good eyes would have claimed it. I’d say the vast majority of misplaced wealth probably exists at the bottom of the ocean from shipwrecks that have not yet been recovered. I think every now and then you will hear a story about someone maybe going into the attic and digging through some of grandpa’s things that had never been gone through and finding something of value. You could have some old people who are still alive who put their coins in jars back then and never cashed them in. You could have unopened safety deposit boxes that have been paid for a long time but never opened or examined. Money could be hidden and forgotten about when the owner died. These kinds of things can and do happen (in fact, it was within the last few years that someone found a stash of 8 gold coins of which it was previously believed there was only one in existence, and that one had just sold at auction for over $4M), but I’m not suspecting the extremely vast majority of people to ever find lost wealth. Honestly, your best bet for finding old silver coins is probably to find property with a LOT of land in a rural area, land that used to be well travelled perhaps but which is not really used for much and is now overgrown, and get a good metal detector. Like I’ve considered taking my detector (which I’ve barely used) to my parents’ house, they’ve lived in the same house since 1976, which REALLY wasn’t that long after 1964, it’s 4 miles from the nearest town, it’s 8 acres and mostly covered in grass. People way back used to farm it, there were outbuildings in areas that my parents rarely even walked into. The house was built at the turn of the century, I have to imagine that someone at some point in the first 50 or so years of the house’s existence walked out onto that land and dropped a coin or two, never to be found. It would be a needle (or needles depending on how lucky I got) in a haystack, but I might net something out of it. I’m not however that optimistic that there’s some shack somewhere that no one has bothered to set foot in for 50 years which just happens to (still) contain things of value. I’d say your odds are better with the lottery.