Is there any easy way to find out what credit card is associated with a Nexus "account"? I've misplaced the piece of paper and while I haven't yet been over the limit, I want to be prepared if I do (and without knowing which card, and whether it's expired, that means going through a regular lane and to secondary). I assume that submitting an under-the-limit card in the box won't trigger a verification of the CC.

Thanks!
=aw