Examine "Squire Rustbucket", or what's left of him, outside Bog Bottom Mill ( 10, -1, -605 ) Copy/waypoint 10, -1, -605.
Return to Sir Tatters.
Examine a chest in the Boar Room in Runnyeye. ( -74, 1, -91 ) Copy/waypoint -74.02, 1.26, -91.28
Obtain the key for the chest from enslaved warboars. These can be found in the same room as the chest, and more can be found in the spiral passage near the entrance, e.g. ( -84, -27, 118 ) Copy/waypoint -84, -27, 118.