It may have spent the night in a jelly jar with some lemon juice and a bunch of pennies.... even the dents get plated.
Dear god! Some sicko coin-presser who works at the US Mint must be staying after hours and running off batches of copper nickels and furthermore, he's been doing it for years (since the 1960's!) and never got caught. They really gotta get some security cameras in there. He's probably doing nasty stuff with the coffee pot, too....
All Is Explained in the Unread Thread. But here's my theory: this guy at the Mint who's been doing all these copper nickels sub rosa even runs around at night; burying them in parks and playgrounds, all over the country; so that these super-rare coins can show up not only in the change dish at the Pick n' Pay, but also at the bottom of holes dug by metal detectorists! I just happen to have several of these astounding coins in my possession, which I may be persuaded to turn over to some lucky collector, for the right price. At Your Service, P.T. Barnum.
Please forbear with regard to the above, for as we say here in The Garden State: this particularly repetitive skein of reparte' is ..."gettin' kinna stupi'..," and me along with it. One can liken it to the swarming, ever-advancing armies of the undead; each shuffling grayly-forward to assault the Northern-most Fortress of the Numismatists', as in "Game of Thrones"; each with outstretched, skeletal hand bearing an umber-toned, small coin featuring the likeness of Jefferson. Onward they come, until our weary arms can no longer lift our hands to smite our keyboards....