An easy way to prevent your computer safe from unauthorized access is to leave a sticky laying around that says “Passwords:“.
Then, set your machine to lock itself out after 5 sequential bad password attempts. The lockout should be around 1 hour.
This might help protect your assets from the roving thief around the office from guessing a good password and instead selecting one of the 6 or 7 decoys on the list you left out. This little trick specifically protects you against someone who might think they know your computer passwords.
Remember, always lock your machine when you are not in front of it, or better yet, have it automatically put in sleep mode.