Hope this helps.
Butler Fang spawns at approximately: -323.04, 127.53
He is in the same wing as the Gypsy Pit amd Negotiater Room on map. Down the hallway from the "Kitchen"
(If you go the Gypsy pit, leave through the south door-Turn East-Go to the end of the hall-Turn South and go to the end of the hall-Turn West and that's where he spawns