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That situation is no doubt frustrating. If the manual with the default code is lost, do you have any 'user code' to open the safe with? if so, try that user code.
Also to be tried: default codes like
Red means an invalid code or combination.
Try the default codes, please.
Oh... then try
and then try
which are all sometimes set as default codes.
Then, regrettably, you may under the circumstances simply have to apply to Sentry Safes to have your combination (default, factory, or registered) rendered to you.
Such application generally requires a certified or notarized copy of the bill of sale for the safe to accompany it, in order to validate you as the owner of the safe.
Do you need further instructions on how to go about making this application to Sentry Safes? it seems to me to be the likeliest approach to getting a working code back again, for your safe.