The FFL licence should be copied at least and you keep them for your records, and another copy in the box, in case the firearm is inspected. There is so many grey areas with this, its not funny. My FFL dealer says I have to bring the gun to him, and he keeps a copy of the FFL licence for his records, and he sends his FFL licence in the box to the recieving FFL, who keeps his licence. But I never bought that, but for the sake of simplicity, I have always did this.

But if you read carefully, you should be able to send the gun thru the PO, even though everyone of them in MD refuse. So basically do the best you can to get it to the recieving FFL. Any gun transported needs to have a licence with it.