How do I set or reset the combination on my Lock Box? While some styles might be locked with a key, many lock boxes require a combination to open. Move all 3 digits to 0-0-0. Lock boxes are designed to protect your valuables or personal information. But sometimes a combination lock can be too secure. When a situation arises in which you have to change the lock box code, it's not always easy to remember those instructions you placed somewhere when you first opened the package. If you have inherited or bought a used lock box, then you may need to completely reset the combination in order to access the interior. The combination method is typically more secure, since keys can be lost or stolen. If you need to change the access code for your GE Supra lock box, the process is simple. Make sure all digits are centered on the 0 when opening. To open a new lock box for the first time:. When a real estate agent wants to show the home, he can enter an access code into the lock box keypad to free the house keys. These lock boxes fit around doorknobs and hold the keys to the home. Begin by opening your Combination Lock Box.