I hate to hear about the loss of your pin, Katmandu. Good luck with your search on eBay. I'll PM you with an eBay-er's name you might want to avoid... here's an odd story for you:
A couple years ago I looked to eBay to buy a jeweled pin. Mine is plain, and I'd always wanted one with a little more pizazz to it. I found a beautiful pin on eBay and was the high bidder - yay!
When the package arrived in the mail, I was so excited. I couldn't wait to wear my new pin. I opened it and, instead of a beautiful jeweled KD pin, a Tri Sigma pin was inside the box. I emailed the eBayer I bought it from and explained what had happened. The response, "Uh-oh. I must've sent the KD pin to the purchaser of the Sigma pin. I'll see what I can do."
The person who ended up with the KD pin didn't want to return it. The eBayer offered to pay me back if I returned the pin, but I felt like the Sigma pin deserved a better home than what that eBayer could provide. So, I have a Sigma pin.
I recently got a jeweled KD pin like I had wanted, so the story has a happy ending (for me). I'm still in the process of finding a home for the Sigma pin. Oddly enough, one of my former roommates was a Sigma. I'm hoping she can find it a proper home, but I haven't been able to reach her for a long time.