There are remarkable finds relating to the wide extent of global trade in the ancient and medieval eras. For instance, one viking archaeological site had a jade carved Buddha.
That doesn’t surprise me too much. The Vikings controlled the amber trade, and the Amber Road was pretty much an extension of the Silk Road, so I can see how a rare piece like that might wind its way up there occasionally.
And the copper in the early bronze seems to have come from Lake Superior’s shore.