As a child I was walking down the street and kicked something by chance that sounded metallic. 150 year old coin, irrc. Just there on the asphalt next to the sidewalk.

Unfortunately bronze, with trimmed edges, common mint and worth very little. But if you tell me someone just stumbles onto and old coin in the street just lime that, I pretty much believe it.

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.