Hello. My name is***** can help you with your question.
If you still have the original manual that came with it, the master combination is printed inside the cover. However, if you no longer have the manual – and most people don't – you can still get the master combination from Sentry. All you have to do is fill out an online form and give them proof of ownership and they will be able to give you the master combination. I will give you a link to that page below.
This go to that page for the form to fill out and submit. Let me know if you have any questions along the way. I would appreciate a moment of your time to rate my level of service at your convenience. Thank you.