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Open shutter door to reveal the dials and the release button; Rotate dials to the current combination (if the lock is new, the combination is set at theOperating Instructions: To open lock box first time use (fig. 1):. 1. Press down “CLEAR” (C) button (fig. 1b). 2. Press down “OPEN” button (fig. 1a). 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?