I was waiting for someone to notice that. I'm not sure how they knew, but they asked him specifically about a GA based forum that he was very active on at the time.
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I would think ATF agents browse gun forums for any low hanging fruit. Loose lips sink ships and all. From a technical side of things, I'm curious how they could pin point an individual. IP address? Or do they simply contact forum administration?
Admitting on the internet that "a friend", who's not a FFL, bought receivers in bulk for "investment purposes" doesn't seem to be the brightest idea, but that's just me.
It's quite easy to track most internet users to RL information because most internet users aren't too bright.