This article on physorg.com was posted a little while ago and gives an excellent example of how important it is to stay paranoid (or develop a healthy sense of it). In short, a photograph of physical keys can be used to duplicate them. All that is required is a shot showing all of the details, which can be snapped at quite a distance with the right lens. While it definitely is more of a threat to residential-grade stuff than Medeco government/military-grade locks, it's a great example that threats are everywhere. It's important to always assume every part of your organization is vulnerable to some extent, and to plan for it. Doing so will ensure that you are considerably more prepared for the time when (not if) something fails.