But not the Tonberry Trailers near the entrance from Temple of Uggalepih zone at the Paintbrush Canvas. You have to go the the 'A' area (check ffxi-atlas for a map) to find the right ones (Hug the left wall from the ToU zone then go East at the North-East fork to get there; If you continue north, you'll hit the other ToU zone). I killed more than 3 dozen right outside the ToU zone and nothing dropped. First one I killed past the 'A' area dropped a key.
Succubus bats drop this key. The best camp for this is at H-10, on the same level as where the ZM4 lights need to be lit. Also we killed a Beleaguerer that dropped the key.
I really don't think Million eyes drop this coffer key >.> every site says it does but one night some friends and i killed about 100 of these trying to get a key no drop and also my ls did Hakutaku runs the morning after killing about 100 more of these and still no drop. Then we killed some Tonberry slashers and got key in 5-10 kills. Maybe just bad luck but has anyone got a coffer key off of these? Just wondering.
Tonberry Trailers, confirmed drop. Was camping Celeste-Eyed Tonberry spawn, killing the 2 Tonberry Trailers that serve as PH.. Got the key after 4th or 5th kill.
Killed 40 Tonberry Trailers with TH1 & did not get a coffer key. I fought the ones that spawn right outside of the Paintbrush of Souls entrance in Den of Rancor. (Maybe possible that only the Trailers on the lower level drop.)
The RDM in our ZM4 party got a "Den Coffer Key" after we killed a Bifron (Bomb Mob) that was guarding the Altar of Rancor. So Bifron could be added to the list as a Coffer Key Dropper