That's a good question.....I don't have mine bolted to the floor yet either, but I'm more worried about tipping.....my safe is 42"X 28 X 72......I'd hate for it to fall on a grandchild..........I have read that when placing a safe on concrete, you want at least an inch of breathing room so the bottom doesn't rust out.......
I thought I'd cut a couple of 4X4 to length, then drill them.....then mark the floor through the drilled holes.........hammer drill for a lead countersink....and bolt the 4 X 4 to the floor.......then put the safe in position and bolt it to the 4X4......add some trim to the front and sides.......By leaving it on 4 X 4's I could still get a pallet jack under it if I needed to....but so could the bad guys........
I read an article somewhere the some crooks wrapped a chain around a safe and jerked it out with a 4 wheel drive......pulled out the floor, and wall and drove out dragging the safe........I don't know that you can stop everybody, but the druggies are the ones I think most likely to break in to my place, as I don't have enough for the real pro's.......
just my thoughts, but I'd like to hear from the guys who have done it as well........