GO TO TOWER AND CLEAR YOUR POSTMASTER!!! OR ELSE YOUR KEY WILL DISAPPEAR LEARNED THE HARD WAY WAS FARMING GOT A KEY DIDENT GO TO TOWER RIGHT AWAY, KEPT FARMING THE. WHEN I WENT TO TOWER MY POST MASTER WAS FULL OF BLUE ENGRAMS AND MY KEY WAS GONE ! ;((((( so CLEAR YOUR POSTMASTER !!
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Also if you have exotics, even if they're locked.. they go away too!