The Bull Box is a 'monster drop' that was introduced during the Ratboy's Nightmare Update. It is one of the many collectibles that are needed by the players in order to complete the entries of the Itempedia of the Nightmare. The Bull Box can only be obtained from the Traffic Buster as an 'uncommon' drop.
In appearance, the Bull Box is a black-purplish box with its sides decorated with smaller obsidian-like squares attached to the box. Rusted metal can be found at the very top of the box, assumed to be the handles of the box before it was twisted by the Nightmare.
The Bull Box does not have any usages in-game that will benefit the players, other than to be sold to a selling vendor at a selling price of 10,000 gold.
- Based on its description, the Bull Box is capable of feeling emotions, specifically anger. How the collectible demonstrates it is currently unknown.