The IG reports states that Comey held a meeting at 10:00 am on the 27th.
https://oig.justice.gov/reports/2018/o20180413.pdf (PAGE 7)
The September notification was clearly discussed in Comey's testimony (P172 of the transcript):
Ms. Jackson Lee. Let me answer -- or ask some questions regarding the inspector general's report. I think it was around the 26th that -- September 26 that you received some indication about the Weiner laptop, 2016. And it started in New York, and people started to see emails flourishing, and FBI agents thought it was crucial -- I'm looking for my materials here -- thought it was crucial that you -- that they begin to investigate. And it seems that there was some suggestion in the IG's report of a question whether there was unnecessary delay.
Mr. Comey. Yes, I remember that.
Edited by tigerdb at 17:25:33 on 12/09/18