Did Magic swords Exist.
To make steel you add carbon to iron. Although using charcoal in the fire, was the most common place to find carbon, but theres no reason why you couldn't use the ashes of a cremated King or animal. To the Blacksmith working the metal it would seem the ashes of a giant bear, would be worked into the properties of the sword, seeming to give character and properties with the magic of metallurgy, taking 11 hours of bashing an iron ingot .
if you were a King of a large domain it would indeed be able to find meteors new and from times gone by within the Realm. It would be entirely possible these could have been melted down for use, in special swords.
A weapon made of a foreign material, even just steel, but in the copper age, would indeed cut through a copper sword with a good blow and indeed seem entirely magical.
The copper, iron, steel age, we take dating from are what we have evidence for as widespread human knowledge.
This didn't mean everybody learnt copper, Iron or Steel at the same time.
It is highly possible, a blacksmith master craftsmen would keep the manufacturing techniques a military secret telling only his apprentice from generation to generation. A good Blacksmiths was an essential member of a conquesting army. Battles being battles, fraught with danger In the line of fire not all armies won. The death of the blacksmith, sometimes become the last line of generations of knowledge with secrets dying with the blacksmith. Military secrets would be exactly the kind of thing we won't find evidence for in history and so we can presume many secrets were lost fore ever, countless times.
To take one Historic example:
Alexanders battle of Gaugamela pitted 47,000 in the Macedonian army
52-87 000 in Darius's Persian army. Military strategy and training account for most of the deaths, but metal technology was no doubt a key factor in the pages of history.
Alexander, like every battle he ever faught.... Won.