Sounds like a great way to get a 5 year all expenses paid trip along with a roomate named Bubba.
Highly, highly doubtful. How many people has the ATF put in prison? Fewer than the Poughkeepsie police department.
The ATF has the ability to annoy you, but rarely much more. The exceptions can be counted on one hand. In DC the Dept of the Treasury is taken about as seriously as the GAO.
I'd wait until the ATF starts contacting me before I do anything.