Background checks and serial numbers

[Cman]

I just bought a gun and the serial # and model were written down on the 4473 form before it was sent in.

[Great-Kazoo]

I just bought a gun and the serial # and model were written down on the 4473 form before it was sent in.

AND????????????? This your 1st 4473??????????

Written Down & given are 2 different things. That info is for the ATF and FFL to be able to
1) Remove firearm from log book
2) Show's ATF the firearm no longer in their inventory has been transferred, LEGALLY to someone.
You do not have a firearm on premises / inventory, you damn sure better have paperwork to show where it went.

[BuffCyclist]

I just bought a gun and the serial # and model were written down on the 4473 form before it was sent in.

Before it was "sent in", sent in to whom?