For you fellas worried about leaving a gap under the safe for fear of crooks using a sawzall and hacking your anchor bolts and stealing the safe, FEAR NOT!!! A trip to your local auto parts store and about $25 bucks will make them damn near impossible to saw!!! Get yourself 4 wheel hub bearings. The ones shaped like this, \_/ and its a ton of needle bearings covering the outside. Have fun cutting them, lol. Iv found its pretty damn hard to cut somethig that spins. A buddy of mine showed me this trick. And i tried to prove him wrong with a sawzall and attack the bearing covered anchor bolts that were secured to the garage floor. I failed miserably.
cheap investment that will almost guarentee your safe stays put.