Welcome to Mitel Forums. The Mitel resource - by techies, for techies...
The documents from Mitel were FolioViews nfo files. I don't know if there are any available on-line. I would try www.wedophones.com and see what is there. If only Sx200, the Lightware 16 version will have most basic info
I don't know if the OP has a Mitel account. I still use the nfo for this and 2000 stuff when needed.