Bug: Friden's Bounty (open large chest) cannot be finished -- no key found

  1. Please describe in as much detail as possible how to reproduce the bug or crash.
    I looted everything, opened everything, destroyed everything. No key to open the large chest.

  2. What game version are you playing? You can find the version number on the title screen in the lower left corner.

Just wondering, what punishments active?

everything except exp ones, the 3 members, and instability.