Was friends with Kelley. She informed him of the emails. He promised action.
His action involved reporting them up the line to his superiors.
His superiors decided there was enough to turn it over to cybercrimes.
IMPORTANT: The FBI Agent was not otherwise involved in the investigation in any official capacity. He was not in the cybercrimes unit and was not investigating the matter. He merely alerted them to it. Then, he continually pestered the cybercimes unit and his superiors about the investigation, so much so that he was told to cease and desist.
He got it in his head that there was some kind of cover-up, so he went to Reichert.