I completed the quest..yes my inventor was full .. forgot to check.. so i thought it will on on the stash by the hanger bay..nothing.. not even in the vault.. is this a bug?
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Unfortunately, the Exotic Cipher does not go to the postmaster if your inventory is full. Some people assume it's to enforce there only being at most one in your inventory at any point; some people like to use the postmaster to hold items beyond the limit of what you're supposed to have. In the future, always make sure you have room for it when completing the quest.