Jinghuashei has been NARU'd before. I have a feeling he'll be back... eBay has a tendency to turn their head and look the other way when it comes to our Chinese friends.
You may be right about CC dollars having some trace elements because they pretty much had a single source. However, if you can test for it, you can seed it to make it test right.
This topic reminds me of another similar, recent counterfeiting case: Louis "The Coin" Colavecchio's casino chip counterfeiting operation. Or rather, the sheer sophistication Colavecchio employed with his die-sinking efforts. Some say his use of an EDM machine, and use of tableware as his source for his planchets, was very clever, indeed. See: Robert Matthews Counterfeit Coin Newsletter, No. 7, December 2006 Robert Matthews Counterfeit Coin Newsletter, No. 11, January 2009 Counterfeit Coin-Making Machinery Up For Bid Tomorrow at Police Auction, Amanda Milkovits, projo.com, September 19, 2008
while we are at it, we need to confiscate there nukes as well. easier said then done. and i am sure this problem isn't a high priority with the government. they would rather get rid of all the $100 bills being made.
Some of the coins I've seen from Jinghuashei are distinguishable as fakes because of the fake toning applied. I saw one of his 1916 SLQs; the coin had almost all the diagnostics of a 1916, even down to the slight 'wear' that made it XF. But the toning just didn't look right. At first glance it was beautiful, like edge toning from an album, but on closer examination, one could tell that it had been applied with some kind of spray or applique. Just another tip for something to look out for when examining key dates.