Oh man, I lost a load of guides when I moved about 10 years ago. I owned virtually every single official and unofficial guide for all Resi games from Zero through to... 4, I think was the latest one at the time. I've been slowly building my collection up again over the past few months (I now have the guides for 4, 5 and 6, but can't seem to snag any decent quality classic Resi guides for a good price).
I don't remember the RE3 Nicholai memo, but I can absolutely believe it was in the guide. I remember there being a ton of cool trivia tid bits scattered throughout the books. My absolute favourite of all of the guides I owned was this little A4-sized unofficial Resident Evil 2 walkthrough/guide which my dad ordered over the phone for me; it contained tons of non-essential info and it was AMAZING. I haven't been able to find a copy of it in forever. I remember the front cover had Birkin's tyrant-eye-thing smack-dab in the centre of the cover, and the book was a weird cheery green colour. Odd... but AWESOME.
Now I have to get my hands on the RE2 and RE3 guides again.