Yes, I'm sure that having the opening day folder and map is certainly a plus. As I said, I haven't seen these sold so I don't know how truly popular they are with collectors. EPCOT has relatively few dyed-in-the-wool collectors on its own, but there's always collectors who value the opening day materials from any of the Disney theme parks. I would expect that if you call 1-407-WDISNEY, they could tell you what the tickets are worth in terms of admission to the parks, which would give you a base value to work with.
But you have something of an embarrassment of riches here. That is, you may not be able to find a single collector who would want to pay for all of the passports just to get the opening day materials. You would probably be best off selling one passport with the folder and map, and then sell the other passports separately. The passports should do well on their own because they're so attractive in addition to their base value for admission. It was fun for me just to see the pictures, so I'm sure you'll do well with them in any case. Good luck!
