Solution
The Donut Deception
Stevie said that he was hijacked by a man wielding a Glock, and when he heard the man click off the safety he got out of the van.
However, a Glock infamously has no external manual safety to click, meaning the tale was fabricated and Stevie was working for the Sugar Syndicate who stole our donuts!
Stevie invented one too many details, and Field-Marshal Mogau knew it.