China is land of the free and home of the fakes, in a way.
I lived in Asia and you cannot imagine how many fake stuff are sold there. And selling fake stuff at exorbitant prices especially. Jade, fake coins, fake gold, fake medicine, fake this fake that. Making money out of fake stuff is called “being businessman” there. And there is no guilt in selling fake stuff.
As a tourists in Europe, I like Asian people a lot, because they spend money on high quality items and stuff and are not stingy. They love numismatics and have same concerns about fakes, but are smarter in recognizing them in general dur to this problem.
I have seen people buying fake Imperial era bankontes and coins which were not graded and were simply coffee stained regular paper with a print. I would personally buy only graded items from China and would check graded holders if they have been tampered with. Silver coins are very popular to fake too.
When you see Chinese items at auctions, that are not certified, 99% of the time serious numismatists will not buy them. Risk of getting a fake is enormous.