Yeah, I think I read speculation somewhere about how there has to be a snitch in the equation, but umm, this is the FBI, and the Winchesters aren't exactly the leads in Catch Me If You Can. Sam applying to college put him on the map definitively, with a clear paper trail. And I'm betting John wasn't a credit card scam expert instantaneously. For an expert who's been especially assigned to the project, it probably wasn't all that difficult. And ahaha yeah, there is Gordon.

Dude, who's writing the Hendrickson backstory, where everything starts to unfold, and he's like these people are FREAKS? Ex-marine, mysterious bruises and cuts on the kids at every school they hit, living on the road.