Unlocking Master Lock Box: 4 Digit Combination Guide

If you have a keyless lock box that requires a 4-digit combination to open, such as those made by Master Lock, it can be frustrating if you forget the code. Fortunately, unlocking your lock box is not impossible. In this guide, we will provide step-by-step instructions on how to unlock a Master Lock Box with a 4-digit combination.

Unlocking Master Lock Box: 4 Digit Combination Guide

Before You Begin

Before attempting to open your lock box, make sure:
– You are authorized and allowed to access the contents of the box.
– The battery in any electronic components of the lockbox is working correctly.
– Follow these instructions carefully and precisely; incorrect handling may damage or malfunction the lockbox.

Steps to Unlocking Your Master Lock Box

Follow these steps for opening your locked mailboxes
1. Reset – First Reset everything by turning reset key/knob (usually located near the shackle) clockwise until it stops at “Set” position
2. Enter current code – Slide/Move down & up all dials one by one until they stop at its correct digit
3. Pull up shackle – Hold down shackle downwards (don’t release), enter present code but do NOT turn cylinder yet
4. Change Code – After pulling up Shackle change your code dial positions & memorize it or note somewhere safe.(Be aware! Don’t close shackle without testing new password)
5. Close the Cylinder door

Tips for Making Your Combination Easier To Remember

If remembering combinations is challenging for you,
– Use dates that are significant like annual holidays birthdays etc.
– Make sequences easily memorable like Birth Year / Car Registration Number / Mobile Passcode /Anniversary Dates
With practice and time spent using them daily memory muscle would get trained.

By following this guide, you can quickly regain access to your Master Lock Box, even if you’ve forgotten the code. Remember to keep your combination safe and secure to avoid having to repeat this process in the future.


We hope that our guide has helped you successfully unlock your Master Lock Box with a 4-digit combination. If these steps don’t work for any reason or damage occurs, please contact customer service before attempting anything further on your own. As always, remember to respect privacy and only open locks when authorized and allowed access is given.


Here are three popular FAQs with answers for unlocking a Master Lock Box with a 4-digit combination guide:

Q1: What is the default combination for a Master Lock Box?
A: The default or factory-set combination for most Master Lock Boxes is 0-0-0-0. However, it is recommended that you change the combination to something more personalized and secure.

Q2: How do I reset my Master Lock Box combination?
A: To reset your 4-digit combination on a Master Lock Box, follow these steps:
1. Open the lock box and locate the Reset button.
2. Use a pen or other small pointed object to press and hold down the Reset button until you hear an audible click.
3. Set your own new code by entering four digits into the top of your existing old code.
4. Release the Reset button once your new code has been set.

Q3: What should I do if I forget my Master lock box’s combination?
A: If you forget your lockbox’s current combo, try using common combinations like ‘0000,’ ‘1234’, etc., as sometimes users may have inadvertently changed their original number while manipulating numbers randomly in trying to unlock it; otherwise follow these steps:
– Contact customer service at (800) 227-9599 Monday through Friday from 8AM – 5PM EST
– Provide proof of ownership, such as registration information or a bill of sale
– A customer service representative will provide instructions on resetting your lock box or request that you send it back to them directly for assistance in opening it