I wonder if the warrants were unsigned, to be made up after the fact, based upon "evidence" planted by the ATF? (life imitates fiction, Unintended Consequences?)
The precedent from this "case" is likely intended to help buttress the ATF's new definition of "in the business".
It has to be this. Maybe not a plant but at least hoping to find something once they were in. Doing a risky no-knock makes no sense when you could just pick this dude up at his job.