They weren't sent to "colleagues" within the FBI.   They were given to "a friend" from Columbia University who leaked to the press which prompted a Special Counsel headed by Mueller  to investigate the Flynn incident.   You nicely left out the "leaker friend" part.
COMEY: Yes, I — yes. I think nearly all of my written recordings of my conversations — had a chance to review them before filing my statement.
LANKFORD: Do you have a copy of any those notes, personally?
COMEY: I don’t. I turned them over to Bob Mueller’s investigators.
LANKFORD: The individual that you told about your memos, that then sent on to the New York Times — do they have a copy of those memos, or were they told orally of those memos?
COMEY: Had a copy — had a copy at the time.
LANKFORD: Do they — do they still have a copy of those memos?
COMEY: That’s a good question.
--------------------
STOP SPREADING FAKE NEWS!