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If there's been no activity on the card for 3 months, they can transfer the whole CL. If there has been activity, $500 is the minimum.
That's what I've heard from previous experience on here before anyways.
how long was it you got your second card after your first? After 10yrs the age of all the cards is going to average out pretty well and the point drop should be minimal if anything.
Keep the FNBO for the free FICO. It's no AF so there's absolutely no reason to close it.