Mysterious Lockbox

A reward from the Darkmoon Faire related quest Your Fortune Awaits You.... Whatever could it contain?

Source
Rewarded from the quests:
 * Your Fortune Awaits You... (1) (Elwynn Forest)
 * Your Fortune Awaits You... (2) (inside Deadmines)
 * Your Fortune Awaits You... (3) (inside Wailing Caverns)
 * Your Fortune Awaits You... (4) (Mulgore)