Ditto that. I arrived at the local USPS office to ship a rifle to a FFL. Clerk said USPS does not allow shipment of firearms, I replied "your website says you do". Another clerk informed her that yes indeed, a long arm is allowable.It was like 10+ years ago. I am thinkin it was a statement that there was no ammo involved.. But I am 73 years old and have slept since then. But it did happen. The same clerk is still there. I may go ask next time I pick up the mail.
I could have kept silent about what was in the box, but in this case I felt it's better to educate them so there would not be an issue for some future customer.