Though distant, the Roman empire did trade with the Early Chinese dynasties, and the most eastern Hellenic kingdoms such as Baktria did have some contact
In which era? There was also cross traffic with ore from Afghanistan. Again I'm establishing timeline and distance. Hellenic, if you look up top there, is a few thousand years after the beginning of these civilizations.
I'm joking a bit myself. I mean how do you even categorize that going back 4-6 thousand years? I was listening to some paleobiology lectures at work last week and they thing the Vitamin-D synthesis mutation maybe be more recent (recent being tens of thousands of years in that context) than we think.
