SOURCE: Master lock 5400D lock box
Master lock offer a free replacement service for locks which develop a mechanical defect during normal use.
See their website here for further information -
http://www.masterlock.com/customerservice/
If the lock has been forced or tampered with to cause this problem, then a replacement is needed.
Hope this helps
SOURCE: I foregot the combination to my master lock.
We are a company that uses these lock to show homes and we have 4 locks that we cant locate the combo to. This lock you put the key in and lock it back and it has a 4 combo but the person that handled these have left and didnt give us these combos...cant open them...any ideas on how to unlock these codes?
SOURCE: I lost the instructions to my Master lock box and
how to initially set resettabe master locks
SOURCE: how to reset an open master lock
your answer is on this site
http://www.masterlock.com/faq/lostcombo.shtml
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