I've bought approaching $10K of photo stuff incl leica lens, mostly from US, and occassionally collectables from Russia (small $). I was only burnt once for $20 item. For this guy I forgot to check feedback due to low dollar. That's the key. I only do 100%, or if less, read all negative feedback.
The two leica's on this thread sold in early December. Neither of the buyers or sellers have feedback related to these transactions. I find that odd? My personal experience is feedback is posted to almost 100% of my transactions, by both parties.
Oh well, now I have a iiic in mind, and the only place I'll likely find one is e-bay!