Could I please implore you all to AVOID anything made by Masterlock - apart from maybe their 911 lock series? Anyone with any knowledge of locks know that Masterlock are awful and very very easy to pick.
The key safe for example can be opened by any untrained person in about 5 minutes using strips of metal made from a coke can.
I sent the above link to my firearms office when he suggested a key safe...
Their other locks are usually 4 pin locks, that lack security spool pins. They can be 'raked' open in seconds ... again even unskilled people can learn to open them in seconds.
ABUS are generally better but no padlock / key safe is will deter a professional thief.
As others have said earlier.. Hide your safe keys.