Final Missive can be found in the secret chamber of Gaspin Manor in the Hossberg Wetlands during An Academic Interest side quest.
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Note: Final Missive
...the door. All those days, those long months, only for this? I made—we have an arrangement. No, I... we have what we want. We... no, I'll seal the way, I can't...
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- This note is not included in the Codex.