AS both an eBay sell and buyer, I think you've got plenty of detail here about the items up for bid. You had mentioned in previous posts that the winner will be required to sign an acknowledgment of the copyright issue.

If that still holds true, and if that will need to be done before you send the manuscript to the winning bidder, then I would suggest that you put that information in the listing as well.

eBay has become...not very seller-oriented lately, and resolutions tend to go in the direction of the buyer, especially in cases where details have been left out of listings.