This is very annoying, but there is a workaround. I have ebay Bidder History bookmarks from years ago that uses now-unused code, but it still functions. Like this for example (not me, for the record):

http://cgi6.ebay.com/ws1/eBayISAPI.d...3&all=1&rows=0

If you change the username in the URL (in this case, "mrkeysh") to the one you want to search for, you can see the complete bidding history. Until ebay removes this workaround, this should always work. This is what I use now, since ebay no longer gives you the full results from standard methods.