Items, NPCs, quests, objects and spells of patch 1.12.1, read live from the realm itself.

Gryphon Feather Quill

NPC Level Zone Chance

Elemental Slave 33 - 34 Alterac Mountains 0.02%
Object Zone Chance

Hidden Strongbox Alterac Mountains 40.1%

TWO-SOLUTION TEST 40.1%

Object	Zone	Chance
Hidden Strongbox	Alterac Mountains	40.1%
TWO-SOLUTION TEST		40.1%