has anyone read the full file the fbi released on comey?

i figured out from this archive of a 2011 version that the redacted bit is "SEED NUMBER"

https://archive.org/stream/DomesticInvestigationsAndOperationsGuideUnredacted/Domestic+Investigations+and+Operations+Guide+unredacted_djvu.txt

what's a seed number? and why redact it if it's in a freely available document?