He was just exercising his right to buy and sell. Hundreds, maybe or even more."Selling All Kinds."
Sounds like he was "Engaged in the Business" without an FFL.
No ATF agent was hiding in his buggy waiting for him to sell one firearm.
I think the agents were hiding in his milking parlor or silage wagon.
Or really just bought a few guns and didn’t like what he was doing and now this.