Good morning and welcome to Just Answers,
Your question is quite common on our site as lost safe combinations are often asked to our experts.
Since your combination is unique and only given to open your safe, the recommended way to retrieve the combination will be to contact the company directly. This is for security concerns as no person should have your unique combination but yourself and the company. Contact info and instructions to retrieve the combination can be found here in this link:
Also you can try this suggestion that is offered online:
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Since you do not have the combo, your best bet is to contact the company directly as they will go ahead and look up your combo in their records and then they can send this to your attention.
Sorry that the link is not opening for you. Here is the information that you can use to contact the company directly (Honeywell now owns Brinks)
ADDRESS: Consumer Assistance Dept. LH Licensed Products, Inc. 860 East Sandhill Avenue Carson, CA 90746 USA
TELEPHONE: US/Canada 1-***-***-**** (Toll Free)