I'm a regular CoinStar checker, but not under. Gotta try that. I've found Wheats, Steel cents, 2
War Nickels, a 1912-D
Barber dime, 4 Mercs, 12 or so Rosies, 6 silver Washingtons and dozens of foreign, including 3 Canadian silver dimes, a silver Canada Quarter, a silver Netherlands 25 Cent, a silver UK Shilling. Of course, this is over a 3 year period.
One thing that also works is when someone has just finished, I will approach and ask if they had any foreign and offer to buy it at the US equivalent for the size coin it is. About 75% of the time they just give them to me. It is a rare occasion that anyone is nasty or unfriendly.