This person is wrong, speaking off the top of his head. Comey put every memo in the FBI records. I know the name of the FBI official(s) he gave the memos as he wrote them for him/them to record them. I know the date every one of them was given to the FBI. The FBI has not said there are memos they didn't have at the time they were written, it is the opposite, the FBI had every one of them as they were written.
Some people are writing salacious articles just to be writing about this so their articles get passed around the net, just as this faulty one is posted here.
If I don't know something, I beat it to death until I know all of it. I have done that with this subject - the Russia investigation, who did what and when did they do it not only with Comey, but others in the Justice Department when the Russian thing began. I'll post about this later today, with names and dates.