When I was a teenager I was working at McDonalds and someone came in and paid for a meal using old US Silver Certificate bills. Some people just are careless and don't notice old or unusual things.

I've had that happen a couple times, too. The first time I was super excited, and looked up the collectable price, and it was like $8 for a (pristine) $5 bill. I think I kept it for a few days to show to people, and then spent it. I inherited a couple from my dad last year, and the collectors' price hadn't changed, so I did the same thing. Still cool, though. I hope whatever cashier received them from me got a similar thrill.

Wow. I like how those look almost like modern bills except for a cool seal and text saying it's redeemable for silver, subtle flex.

Only time I ever got rare money was a buffalo / Indian head nickel as change in a cafe very recently, not a valuable form though.

I used to see those once or twice a year, now it's been a decade since I've seen even a $2 in the wild.