It's just officious officiousness. Ignore the part about sending them your permit card. Send them a photocopy of your old one if you like, but don't send them your card. If they give you a hassle, check back here and someone will tell you how to proceed.
Ultimately, even if you did send them your card, you could still legally carry. Your permit is an intangible. The card is just evidence of your permit. Although, if questioned on it and you did not have your card, you would be subject to more officiousness and possibly handcuffs, a disarming, and some involuntary detention until Officer Friendly is able to verify your permit status.
See
this thread if you want more discussion on the issue.