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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Same I just finished the Raid and had the keys in my inventory. After going to the tower to turn in engrams they were gone. Everyone else in my team had them... I was the only player to lose all 3 keys.