So we flash back. Gozer has been defeated, but the GBHQ is still destroyed from when Walter Peck had shut down the containment grid and the ghosts escaped. You see the holes created by the escaping ghosts.
Peter is in charge of destroying the irradiated uniforms. He kicks the box aside and completely forgets about it. The box slides right up next to the new containment unit and starts absorbing some ectoplasmic radiation that happens to be leaking from it. 781b155fdc