I'm not in the FBI, haven't read their handbook, but others say the 302 is required:
Wow. Sara Carter and the Daily Caller? No wonder you're so messed up. I found a PDF copy of FBI Domestic Investigations and Operations Guide handbook mentioned and plugged "FBI 302" into the document search box and this what turned up.
"(U) RETAIN NOTES MADE DURING AN INVESTIGATION
(U//FOUO) Retain in the investigative file (IA envelope) the following types of material
developed when interviewing witnesses:
A) (U) Statements signed by the witness.
B) (U) Written statements, unsigned by the witness, but approved or adopted in any manner by
the witness.
C) (U) Original notes of interview with prospective witnesses and/or suspects and subjects. That
is, in any interview where preparation of an FD-302 is required (an interview where it is
anticipated the results will become the subject of court testimony) the handwritten notes must
be retained.
D) (U) Dictating interview notes on audio tape in lieu of handwritten notes may be viewed by a
court as "original notes" and, therefore, must be retained. Dictation on audio tape of the results
of an interview for transcription to a final FD-302 is not "original note" material and need not
be retained.
E) (U) An FBI employee's notes made to record his/her own finding, must always be retained.
Such notes include, but are not limited to, accountant's work papers and notes covering
matters such as crime scene searches, laboratory examinations, and fingerprint examinations.
If there is a question whether notes must be retained, resolve the question in favor of retaining
the notes."
All I see in there is that when an an interview occurs that requires a 302. That is when the "anticipated results will become the subject of
court testimony" those 302s must be
retained. And apparently the method they are retained is by placing them in what is called a "IA envelope". I don't see any mention of a mandatory 5 day time frame for the write up and filing. Or any time frame mentioned for when that must be done at all for that matter.