Contact them direct. Sometimes they will have some way if you pay them and send a notorized letter saying the box is yours. In fact it is in their FAQ
Frequently Asked Questions
I’ve lost my combination. What do I do?
Last Updated: 1 year ago in Biometric Locks,Cash Wizard,Combination Locks,ESL Series,ESLAudit Lock,General Safe Questions,Handgun Safes,SafeWizard
For Residential Customers:
For security reasons, we can not release a combo to an unknown individual. However, you may contact a locksmith that is registered with AMSEC to verify ownership. To find an AMSEC dealer in your area, please use the Find A Dealer search in the header above.
For Commercial Customers:
Contact your company help desk or loss prevention department, who will in turn contact AMSEC. Once we receive authorization from your help desk or loss prevention department, we will contact you directly. http://www.amsecusa.com/