I think that is the crux of the biscuit right there ...
Wasn’t the means by which the server was revealed in the first place because someone hacked Sid Vicious’ AOL mail account. Sid was a consultant for the CF.
When asked about the CF, Comey said he would not say anything about that and made a point to say the purview of the just concluded investigation was focussed only on the legality of the basement server.