Mocbuild101's working locks and combination safes - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
Working Combination Safe | JK Brickworks
Sheriff's Safe] [BrickLink]
World's smallest Lego combination safe! Full tutorial - YouTube
LEGO MOC Combination lock by BrickDesignerNL | Rebrickable - Build with LEGO
Here I present my Lego Technic MOC combination lock safe. It has four eight letter word reels and can make 522 English words. You change the code using the hidden floor inside