Salutations. I've at last found the time to look into that missive you found on the Scourge. Though it took some doing, I believe I have discovered a living relative of the deceased.
Maxwell's sister, one Zarena Cromwind by name, runs a small weaponsmith shop out of Booty Bay. I'm unsure how close she was to her brother, but if you find yourself passing through, you should arrange a meeting. Closure on these matters is precious and rare in this day and age.