I’ve read that Roman coins were in circulation for so long and so many were minted over nearly a millennia, that even today so many still exist that they aren’t worth a whole lot. Lol! Basically, somebody finds a few Roman coins and thinks they will be rich only to find out they’re worth $50.
Apparently in order for them to be worth a lot, you have to show the provenance of them...I’m not sure why...maybe they’re too easy to counterfeit.