From an itinerary of Xuanzang’s famous 7th-century pilgrimage from Tang China to India, a report quite easily interpretable as describing a Tocharian or Tocharian-derived population (Watters & Smith, 1904: 290):
This country [Ortu Kan: "Kie(Ka)-sha" (Kashgar, a place still very much around today)] he describes as being above 5000 li in circuit with many sand-heaps and little fertile soil; it yielded good crops and had a luxuriance of fruits and flowers. It produced fine woollen stuffs and fine woven woollen rugs; the people had the custom of flattening their babies’ heads by compression; they were ill-favoured, tattooed their bodies and they had green eyes; their writing had been copied from that of India, and although changes had been made the substance was still preserved [Ortu Kan: apparently referring to one of the Brahmi-derived Tocharian abugidas]; their spoken language was different from the languages of other countries [Ortu Kan: presumably meaning the Indo-Iranian branches of IE, Turkic, Mongolic, and Chinese, if not others]. The inhabitants were sincere believers in Buddhism; there were some hundreds of Buddhist monasteries with more than 1000 Brethren all adherents of the Sarvāstivādin School; these men read their scriptures much, without penetrating the meaning, and so there were many who had in this way read through all the canon and the vibhāshās (or Commentaries).
The commentary elaborates: “instead of the “green eyes” which the pilgrim ascribes to the people other authorities represent them as having “turquoise pupils”. We are told also that all the inhabitants of this country were born with six fingers on each hand, and six toes on each foot.3” (ibid.: 292).
Watters, T., & Smith, V.A. (1904). On Yuan Chwang’s travels in India, 629-645 A.D. (Davids, T.W.R. & Bushell, S.W., Eds.). London: Royal Asiatic Society.