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 50-60 level range. In particular, these are found in the instances of Blackrock Depths and Blackrock Spire, and in the zones Swamp of Sorrows, Blasted Lands, Winterspring, and Silithus, as well as some lower-level mobs in Hellfire Peninsula.

Note: that mobs that can spawn at level 49 will instead drop Sturdy Junkboxes even if the particular spawn is over 50.

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

As a quest objective
This item is an objective of Junkboxes Needed, which rewards reputation with the Ravenholdt faction.