Welcome. My name is ***** ***** would be glad to assist.
The combination is supplied in the original manual if that can be located.
Unfortunately with a lost combination, there is only one option for the retrieval.
That is through Honeywell.
Honeywell purchased the Sisco branding which had already acquired the Brinks safe line.
They have strict protocols to protect customers from stolen safe entry.
You have to fill out a form and have it notorized along with all the information asked and then they will provide you with the factory combination for entry.
You can access the page that explains the steps necessary to get the combination and also phone numbersto speak to a representitive if you wish.
Wish there was a quicker way, but the system is designed for your protection.