TexasCHLforum.com

I'm gonna throw my two cents in a few days late here. I've got a friend who owns a locksmithing company, and I've learned a little helping him out from time to time. It's surprisingly easy to move even very heavy safes if they are unsecured. 2 reasonably strong people with a pallet jack can easily lift and move an unsecured safe-in fact, on a concrete floor, a single person can roll a 4000 lb safe on a pallet jack.
Also, you would not believe the different ways of opening a safe. The most common method I saw was pretty unsophisticated. They just took any number of different power tools to the safe. Unless there is a remote monitoring system(that they cannot find and disable), they will generally have more than enough time to open even a commercial anti-burglery safe.
It's scary what a determined person with a 20lb sledge and an angle grinder can do in 20 minutes.