The guy replied and sent several high-res scans. There's no doubt someone could come up with a great HBO DVD cover using the pages he scanned.
He is very nice and also very interested in the preservation work. He also has a 16mm copy of Star Wars that he sometimes shows in private screenings. If we have any members in France, maybe you can meet him in person and go to one. I gave him a link to our site, so maybe he'll join and give us a look. He sounds like a wealth of info and sympathetic to our cause.
Here are the files he sent;
http://s1127.photobucket.com/albums/l634/Anchorhead/HBO%20preservation/
Photobucket downsized them a touch, but they're still very good. If you need the originals, PM me with an email address that accepts large attachments.