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Operating and Mounting Instructions FAQs from Master Lock. Learn more. Q: Where can I find the instruction sheet of my Select Access Key Lock Box? Opening the key storage compartment door. 1. Open front shutter door to show the combo dials and the release button.Resetting your Combination Lock · Open your lock by entering the lock combination. The factory-set combination is 0-0-0-0. · Turn the shackle 90° counterclockwise Key Storage. Compartment. Compartiment de rangement Operating Instructions: To open lock box first time Save your combination in a safe place.