So... In other words, you have a one in a million chance to get one piece?
That's... Kinda not really fair, not gonna lie; considering how often you're able to pull the sword from the stone. Aren't there any other ways to get the keys at least, besides pulling the sword from the stone? I mean, you could have at least ten or more sword pins in your inventory, and you'll blow through all of them without getting a single pull.