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AMSEC has made several safes with the 6030 numerical designation. Do you know which letters preceed those numbers?
AMSEC usually sends their safes with a combination already set. If one was not included, it can usually be recovered from AMSEC. If the combination is set to any sort of default, it would be 50. However, do not prepare the safe for use until you know whether this is the case or not. It is a lot easier to figure out the combination when the door is open than when it's closed.