Well, actually, yes, in a way. Federal law requires that you notify the shipper in writing for any firearm shipments. While the USPS does not require it for long guns, only for handguns, that does not change the other requirements.
I talked to FedEx and they did not have a clue about it since they said to talk to the BATF, but that does not help with what they want for having it in writing. I guess a post-it note will due :-).
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