Went looking in the FBI FOIA reading room. Did some digs long ago and thought it was time to look again. In HRC part 31 of 31 was an intrasting document from the IC IG (June 2015) re: Secretary of States' use of personal email servers. Turns out, they were looking at not just HRC, but a total of 5 SoS! AND apparently, the review of FOIA documents was being done in part by retired foreign service employees. WTAF?
https://vault.fbi.gov/hillary-r.-clinton/hillary-r.-clinton-part-31-of-31/view