Maybe its a bit offtopic but i hope it dont disturb no one or the post itself.
One of great uncle has a lot of 24h vending machines and some other business that have no relation with vending machines but run with coin machines.
As far as i know, one of his daughters have tell my mother that, somehow, they get a lot of foreign coins instead of euros, which in the end its a great problem for them since not even the bank exchange them this foreign coins to euros.
For us it can be kind of ok as numinis say at the start, but its becoming a serious problem for some business; here in little city in the north fo Spain where i live, even the policie sometimes goes store after store telling that it have been reported that someone is sneaking amounts of foreign coins.
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Going a bit back to the original thing of the post, I have remember that when i was a teenager (around 16 years old more or less) one day i was working and i got
1 Real from Brasil instead of 1 Euro. I remember i was amazed with the coin, it was shiny UNC or AU, so i kept it