Im not sure if these guns can be used or are in MWZ but in the main treyarch zombies map, we have never seen these guns in action, the weirdest one for me is the desert eagle, you are telling me that this iconic and emblematic weapon was never been introduced to a zombies game?
Other examples i can think of are the models 1887 (specifically this ones, not a modern version of them like in IW), the ACR, the MP7, etc