I read elsewhere that a few years ago, FFL dealers around the country were reporting that when the BATF did their audit, they went through the whole 4473 book, photocopying every page.
Dunno if they are still doing it, or if there were some specifics involved.
Well good for them. While they were busy washing Firearms to Mexican Cartel Members, Americans kept buying guns.
I sold all those they have records of to Juan from Tijuana.
Short feller, bulging midsection, straight black hair, speaks broken english, had about 23 little brown kids with him.