the camoflague value of the vending machine is high. Really, what crook is going to think there are 30 guns behind the "Fanta" sign as opposed to the one that is emblazoned "Remington" or something on the front of it?
If on the front it said "CAUTION HUMAN WASTE SAMPLES---BIOHAZARD" with a nice official looking sticker that might keep a BG, or anyone else, from opening it.