I remember trying to get an FFL number in order to send a gun to a guy in Michigan.
He was going through Gander Mountain.
They would not send me a copy of the FFL (because they only send to other FFL's). So I asked them for the numbers that would be required just to do an easy check.
They refused.
I asked the rocket scientist manager to look over her shoulder and tell me if their license is posted in a conspicuous place, as required. She said yes.
To which I said, "So, anyone can come in and copy down the whole thing just by looking at it, but you won't give me a portion over the phone just so I can verify it?"
She said that is correct, no numbers for you.
The buyer had to go to the store and get the numbers for me, just so I had something for my records.