The only way the media would find out is if the FBI leaked it.Think Comey was in a bad spot with the email investigation. The FBI had to move on Wiener's emails, and one why or another the media would find out. The FBI did have the header data for the emails, and I hope they found something significant before announcing the case was open again.
The FBI did not report that several branches of the FBI are currently investigating the Clinton foundation.
The question is why they would release this info, knowing that it would change the election, while refusing to release links between Russia and those same leaked emails.
Its already been stated that releasing the Clinton info was against FBI policy, the same policy he used to not release Russian hacking allegations.
That's what makes him look really bad.
Comey is in a much worse spot now.