This safe has a preset combination set at the factory so nobody will know your unique combination other than the Sentry company. The best and recommended way to retrieve your unique combination is to contact Sentry directly as they can retrieve your combination for your safe. Follow the simple instructions in the link provided:
I hope my assistance was helpful in contacting Sentry to open your safe with your own unique combination. If you could take a moment to rate my assistance to allow me to know I was helpful in assisting you as well as allow me to help other customers on our site.