@r9etb
The FBI was looking at what Hillary allowed them to see. Those emails had been reviewed by hillarys people and clearedo for the FBI. They had already been sanitized to protect hillary.
This new information was not cleaned by her tech people.
That's an excellent observation. Seen from that perspective, this is quite possibly a very big deal.
And so the investigative team sees this, and immediately realizes what they've got: "Hey, boss -- we got an unfiltered version of Hillary's e-mails from a different source!"
Among other things, now they have the chance to see if there are any e-mails in this batch, that were not among the "official" set provided to them by Hillary. That alone would probably be indictable.
And if there's new stuff that is damning in some way ... then you get obstruction of justice, as well as the other stuff.