Alaska was peopled in the Holocene (>10k years ago). But yeah, i think you’re right: I tend to think of the particularly coastal Arctic people’s across AK/Canada as having more consistent inter-tribal contact and periodic aggregation than between Arctic and more Southerly tribes. Not crazy to think trade goods could flow between the indigenous people of the east and west coasts of the Arctic, albeit slowly. I think far, far more likely that this item would have come to Alaska via Siberia though, if for no other reason than proximity. Fascinating to think of the story of that bead. Blows the mind.