I was doing some googling and I came across this report from Sandia National Laboratories: The Perfect Heist; Recipes From Around The World (pdf).
It is an analysis of 23 robberies from high value targets around the world, including commonalities and lessons learned.
I thought this conclusion was interesting:
An important implication of this information is that a security system for high-value items that principally (or solely) relies on keyed locks, cameras, and unarmed guards may be at high risk for exploitation and defeat.
Thoughts?