Heavy Junkbox

Heavy Junkboxes can be pick-pocketed by rogues from various level 51-60 mobs in zones and instances.

Source
Heavy Junkboxes are pickpocketed from humanoid mobs in the instances of Blackrock Depths, Blackrock Spire, Dire Maul, Scholomance, Stratholme. They can also be found on humanoids in Eastern Plaguelands, and on a few other scattered other mobs throughout the world.

Contents
These boxes can be lock-picked by rogues with 250 skill or higher. They may contain:

Heavy Junkbox as a quest objective
This item is an objective of, which rewards reputation with the Ravenholdt faction.