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A TL30x6 or higher is probably safe.
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Safe is the operative word. A TL rated box is truly a safe. If your door says RSC on it, it is more of a deterrent than a safe. RSC is better than most aluminum foil Stack Ons, but not better than a UL rated safe. Bolts, bars, gimmicks won't make a rating. Thick and hardened materials will.
But many can take the defeatist attitude and buy a $76000 pickup but not spend money on a good safe because "5 minutes with a grinder will defeat it". Just 'build a box' the guy said. People like this won't bolt their safe to the floor. If the safe can be moved, the thief then has all the time in the world. I bet half of arfcom didn't bother to bolt their safe to the floor. Even a 3000 pound safe can be moved very quickly with simple tools by someone who isn't really an expert. I have seen me do it several times.
I didn't attract a single bit of attention when I did it. Cover the door with black plastic and you are simply moving a box.
Many basement dwellers are too introverted to talk with their neighbors. It is nice to have a neighbor call you and tell you a strange car is in your driveway. You won't get this by being an asshole to your neighbors. Layers of security, vigilant neighbors, alarm, cameras, locking your fucking doors and windows, etc. are all more important than bars or bolts in your safe.