I recently had to do some shuffling around of several bank accounts, and I got the attached letter from my bank to my "old" address as a security confirmation. The idea is that if somebody else had somehow changed my address (say, to intercept my statements), I'd receive a notification for it. It's a very good policy.

In this case, however, it's more "amusing" and "pointless" than "secure". In fairness to Wells Fargo Bank, my couple of accounts were quite messed up, and there had been a lotof changes, and it's not surprising that the chain triggered this note to me.