The rules themselves are the same in the deluxe as the pocket box with the exception of the additional 'fluff' material on the illuminati cabals themselfs and the optional rules.
For a *.pdf of those rules they are under the illuminati section of the SJG web page:
http://www.sjgames.com/illuminati/im...nati_rules.pdf
They added 2 or 3 rules in the Y2K and BFD Expansions.
I'm not sure if there is really any point to chasing after the original rules aside from completing the box set idea.
Hope this helps, though I suspect itls not quite what you wanted.