My personal theory on this discovery...

"You-know-who" has rewritten history again. 3,000 years ago, Germans had built a mighty empire reaching the pinnacle of civilization with starships, replicators and flying cars. This sword is an advanced replication of a real 30,000-year-old bronze age sword perfectly recreated by technology we're only starting to imagine today. They were the most advanced civilization this planet ever gave rise to. What happened to the mighty German empire you may ask? They let the [redacted] in.

That was Imported from "Wakanda"...

Obviously...