Posting this because I want to see if I'm doing anything wrong here. I've spent now 3 days (6-7 hours total) killing orcs both inside Monastic Cavern as well as the center island in Davoi and still no key. I've been killing the champions, dreadnoughts, dragoons, and farkillers which according to ffxiwiki are the ones that drop the coffer.
Been getting tons of testimonies, but still no coffer key, and all this with TH3. I just want the damn hunter jerken!! lol. Can anyone here who has farmed this confirm how and where they got it?