Home Improvement Questions? Ask a Handyman for Answers
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You can contact Diplomat to request the master combination and a replacement key.You will need to provide notarized proof of ownership.http://www.diplomatsafes.com.au/Alternatively, a local locksmith could assist you getting into it using othernon-destrutive or destructive means.
Ok, then your best option is probably to use destructive methods to access the contents if you want to get it opened.