From what I understand, you can pull the listing from Ebay right now. The reserve isn't met, and I don't believe there is a legal oblicgation preventing you from doind that, getting the offer down now!
If you want to realize anywhere near the value of what you have, you most likely need to break up the collection into small groups and individual items, take jpgs of each, and then list them separately.
My wife help a private online auction of a much smaller lot of mixed A/D&D agming materials and various other RPG associated items that a friend of ours wanted to dispose of. It brought in a hefty sum. What I see happening with your offering does not bode well for a fair deal for yo.
At worst you could perhaps sell off the lot at the GenCon auction.
Gary