So last year, I figured out a way for us to keep track of the pins that a few specific ebay sellers were selling. I created a Pinpics account, and simply listed all the pins they sold. Then, I thought, people could simply look at the lists and compare their accounts to that one. Unfortunately, I figured this all out right before New Pinpics was launched that did not allow for the same compare features as the old site. So I stopped updating it because I didn't know how useful it would be anymore.
Now that DPP has compare features, I added an account over there, and I'll start updating it again.
So go to DPP look up the user "badebay." Easiest way is to view your collection, then in the URL change your username to badebay.
Collection = icy seller (last updated in Sept, but I threw on some of the recent stuff in this thread just now)
Trades = will be seller #2 (not updated at all)
Wants = seller #3 (tiny bit started back in Sept)
To check for matches between your lists and this account, you can use the compare tools.