Is your safe made by Sentry or another manufacturer?
If Sentry, you can try all the combination numbers you 'think' you remember and see if you can get it open; if not, the only way to retrieve the original factory-set combination is to go to the following website and follow all directions to request a lost or forgotten combination. If this is urgent, you can get 2 day expedited service for your combination, for a small, additional fee:
I wish you much good luck with your safe!
If I have fully addressed your concerns, kindly take a moment to rate my service with 5 Stars. If you need additional information, please reply at any time. I will always be available to you, even after rating.