IMHO, theres one reason to bolt your hunk of metal down...and thats if you have big mouth. If you let the world know you have a safe and possibly whats in it, it allows the crooked to prepare. However, your average criminal is not going to bring a fork lift to every job he does. probably a couple of standard tools at best. EVEN IF the criminal breaks in, sees your juicy safe and wants to take it, it doesnt seem realistic for him to double back, get the resources he needs, and go at your safe without A) you coming home or B) someone seeing something fishy going on. Not to mention if your safe is 4500 lbs, its big, which means you probably have a lot going inside, which means overall its going to weigh well over 5000 lbs. I'm a realist, I just don't see the common criminal having the intelligence, drive, or resources to take even my 1000 lb safe from my home.