There could be an error of some kind, but just to double check: after you killed the drones, did you see the maximum temper buff appear? And did you open the second crate after killing the boss?
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And really dumb question but are you sure that's that's the key you need?
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1. Yes, I am sure that I got the maximum temper buff. 2. Yes, I need the butterfly and fishhook key. I know Gofannon drops the butterfly, and Izanami drops the fishhook.