Clear the Supra lock box by pulling downward on the slider switch located in the center of the box.
Push down on the buttons that correspond to the combination of the Supra lock. Most Supra locks have a four-digit combination. Make sure that each button is pushed down as far as it will go.
Press down on the lever tab located at the top of the key box and pull it outward. This opens the box to reveal the key that is stored inside. The key may either be sitting inside the box or attached to a small hook on the back of the faceplate.
Use the key to open the door and access the building.
Put the key back inside the device. Insert the faceplate back into the main device and pull down on the tab slightly. Push the faceplate backward until you feel it click into place and release the tab.
Pull the central slider to once again clear the combination.