I've been using this for quite some time now. I've found it very useful and is a great timesaver as you don't have to search page after page of info. Hope you find it useful too. Just type in the name of the Seller and press your enter key. You will get a complete history of the seller (that screen name). You can also enter your own name and check out your own history.
http://www.toolhaus.org/cgi-bin/negs
http://www.toolhaus.org/cgi-bin/negs