Thank you for educating me :o  Xinjiang during the time when Chinese civilization started was nothing more than an obscure area of mostly arid land and deserts where nomads roamed. These white mummies could have wandered into the Tarim Basin unfamiliar with the geographic location then died out of old age or from some injury during their travels- or lived their rest of their lives in a small village in a substenence lifestyle. They built cities in Xianjing. They were there for over 1,000 years before Mongoloids even showed up. Their cities now lie in ruins. The Chinese were well aware of the White people across their western borders. They wrote about them in ancient texts. They interacted.