"The strongbox was Loris. For years, she kept it tucked in a bedroom closet, among a long list of items her husband, Blake Ruff, knew he was never to touch. Blake being Blake, he obeyed."
This is interesting since it tells us that it wasn't just the lockbox that was off limits but a long list of items.
"In September 2011, Velling was at a meeting in Washington, D.C., when a congressmans aide gave him a three-ring binder. It contained items from Loris strongbox and other documents pulled together by the Ruff family. By this point, they knew Lori wasnt Lori. They wanted help figuring out who she was."
This tells us that not all the documents presented to the investigator were in the strongbox.
"In the strongbox there also were letters of reference from an employer and a landlord. And the scribbles: North Hollywood police. 402 months. Ben Perkins, an attorney."
This tells us what we know for sure was in the strongbox.
Possibly the other items were things that the family found around the house (possibly among the long list of things he wasn't to touch) or possibly things that have been dug up by the family or investigators. I keep seeing references to say all of these items may have been very important cause they were in the strong box but really all we know for sure was in the strong box is the letter(s) of reference, and the notes page. Also it states "letters" is this a typo or was there another letter of reference from a employer/landlord that they have not provided?