A while back, ebay switched their servers so that not all the auction page information is available when saving as a full set of files. What I do, and I save a ton of ebay auctions for research purposes, is to create a folder for the auction, name it, and then save it as .html webpage only, not complete. In XP, you have to choose that format from the dropdown menu when you choose Save As.
If there are nice photos, save those separately.
The complete Save As isn't necessarily worth it because of all the extra bits you save that make up the page so the .html page only is faster and smaller.
Regards,
Bart