While going through a penny role I came across an Australian $.05 coin. You must be logged in to see this link. It was interesting to find. Its the only silver coin I have found while searching NF string boxes. I thought I might be joining the silver club, but it isn't. However, someone is selling it on feebay for $2.00 with $2.17 shipping.
I've yet to find a non-Canadian foreign coin in a roll, though I've gotten a couple in change before.
And he that hath lyberte ought to kepe hit wel / For nothyng is better than lyberte / For lyberte shold not be wel sold for alle the gold and syluer of all the world. -Caxton's edition of Aesop's Fables, 1484