I don't have my C&R Reference Package handy, but I think if anyone will take the time to research it, they will find that the C&R License allows you to RECEIVE eligible firearms in interstate commerce... I don't think any kind of license is required to SHIP a firearm... the law only states that the receiver be licensed to receive the shipment... ergo, you must be in possession of a valid copy of the RECIEVER's FFL or C&R License before you ship the item...
Case in point... I discover via the internet that one of the folks I regularly correspond with in another state has just inherited a Luger pistol that was brought back from WW2 by his uncle Fred... While he appreciates the gesture of his uncle, his wife refuses to have a firearm in the house. I offer to purchase the C&R Eligible pistol for market value and to not let it out of my sight as long as I am breathing. My correspondent agrees to the exchange of money for the Luger and I send him a wet-signed copy of my C&R License with a bill of sale and check... he then wraps the gun securely and uses an overnight service (of whatever choice) to send me the Luger which I promptly log into my ATFE required C&R collection logbook...
Have any laws been broken? Short answer: NO.
Comments on this fictional transaction are solicited from the peanut gallery Buffalo Bob...