Thanks 
With the Hero's keys you mean the key Icons of Four Swords, right, HylianFox? The ones I've got in gold, silver and bronze. You know, I think that's how they are.
It's long ago that I've played Four Swords, as I have only one copy of the game (And I can't emulate multiple GBAs on my PC, as it's too slow). So I can't be sure, of course. But one Slot on my Game has the three Keys, and all are silver. But whatever... the point is that I think that there are only the three colors (gold, silver and bronze) for the keys.
Sure you can use them, Miles07. :]
Edit:
Updated the first post with some new rip.
With the Hero's keys you mean the key Icons of Four Swords, right, HylianFox? The ones I've got in gold, silver and bronze. You know, I think that's how they are.
It's long ago that I've played Four Swords, as I have only one copy of the game (And I can't emulate multiple GBAs on my PC, as it's too slow). So I can't be sure, of course. But one Slot on my Game has the three Keys, and all are silver. But whatever... the point is that I think that there are only the three colors (gold, silver and bronze) for the keys.
Sure you can use them, Miles07. :]
Edit:
Updated the first post with some new rip.