Well, we know that nothing that happened in China before 1948 matters. History began with the revolution. I view the interest in old sites as a good sign that the grip of the maoists is loosening.
There was an article in NatGeog some years back, regarding the Euro-mummies and whatnot in western China. A bit of pottery was found which had the fingerprint of the potter. That's not uncommon. The secret policeman overseeing the dig asked the writer of the article whether the fingerprint could be ethnically differentiated. The writer said he didn't know. He noted that he never saw the pottery fragment again.