Did most of the raid and got 2 keys, changed character to redo the story, changed back to my original character and the keys are still there. I started up the raid to get the chests and the keys where gone. This robbed me of my hard fought loot and wasted my time.
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I to lost my 3 keys. We didn't beat the final boss. All three keys were in my inventory. Return to raid, now they gone.