Do they have an expiry date? If they do, is there a way to find out?
It's not really that. My Nintendo Network ID is set in Canada, if Nintendo is kind enough to give me money (like the SMT IV x FE: Awakening deal) I won't be able to use that money, because my Club Nintendo account is set in the U.S and now I can't change the region. That's why I want to get rid of my current Club Nintendo account and make a new one set in Canada as soon as possible (Still have 445 coins in that account).
As for the expire date, the coins last 2 years. Here's what it says on the Nintendo customer service site:
4. When do my Coins expire?
The length of time that Coins are valid is measured in Club Nintendo years. A Club Nintendo year runs from July 1 to June 30. Coins are valid for at least two Club Nintendo years; they expire on the third June 30th after their issuance. For example, if you are issued Coins on February 14, 2009, they will expire on June 30, 2011.
Nintendo and PC gamer