Wow, that would be quite a trade route:
Arctic to Cambodia.
Obviously the question of how and in what shape Mammoth tusk arrived in Cambodia is pretty far reaching.
-was there regular trade between South East Asia and the Arctic
-how extensive, how long and what route.
Fascinating how scientific inquiry can illuminate dark corners one never knew existed!
Since elephants are there now, it seems likely that mammoths were there before, and long ago. I couldn't find a map showing their ranges.