One key is heavy enough to lend weight to its story. Another has a different shape and a different lineage. Both are called the Original Court Key. Before anyone reaches a gate, the objects have begun to disagree.
The sellers’ claim is larger than authenticity. Whoever has the key is supposed to possess a special means of entering the Court Between Worlds. A piece of metal becomes a credential; reflection acquires a proprietor.
Most Schools reject the premise. The Court is not a locked physical realm. The Magician and the Gate at the Baseline offer ways to approach the story, but neither supplies the missing lock or grants interpretive rank to its holder.
The key might be beautiful. It might have a real history as an object, quite separate from the invented lineage attached to it. Someone can value its workmanship without buying the authority claimed for it.
This is why the inventory keeps it as a rejected relic. No responsible reading requires it to be bought, carried or inherited. Leave the keys on their trays: the conversation can begin elsewhere.