Pizza box

Another recurring theme leading us to the ARG are the mysterious occurrences of pizza boxes found throughout the levels of Black Mesa. The locations where they are found can typically only be reached by noclipping. Sometimes the pizza boxes are accompanied by a Biodome logo on the wall or on the floor at the same location.

Markings
On the bottom side of the box, there are several markings:
 * The European Conformance logo CE, usually given to household appliances or the like
 * A recycling Logo
 * Two Japanese recycle marks
 * Probably a RoHS check mark

Locations
Below is a table listing the locations of every pizza box in the game in both the 2012 Mod Release and the 2015 Steam Early Access Release of Black Mesa.

The locations have been found by searching for every instance of the model file for the pizza box (models/props_canteen/pizza_box.mdl) in the .vmf source files of the maps. For the mod release of Black Mesa, the maps were decompiled in order to get the .vmf's. For the Steam release, the original .vmf's for the single player campaign included with the game were used, and just the multiplayer maps were decompiled. For the Surface Tension Update (cu3) and later releases, decompiled .vmf's were used as updated official .vmf's for these releases have thus far not been released to the public.