I do agree with you - except for the very first big chest I ever opened (my first Gally) the other times I've used my keys were crappy Queen's weapons and ... ammo synth! Anyways, if you didn't already know, you get a key each week after turning in all of the Queen's bounties.
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That's false! There's no guaranteed key drops except from completing HoW story mode
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No you don't I did all the queens bounties this week and all I got was more spin metal it's not guaranteed to get a key it's just more shitty rng