I think there's a bug going around cause, I lost all 5 of mine after completing the nightfall. Bungie really needs to fix this cause I'm tired of losing skeleton keys.
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I lost mine too. I had 5 on my titan and one key in the postmaster. Lost all 6 next time i signed in. My other characters still have their keys tho :-/
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Dont save more than 4 keys,because you lose them. Bungie dont care like many things.
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I only had one and after completing the nightfall and getting another. I had none in my inventory or anywhere :/ so I don't think it matters how many you have at the time