We discussed this a while back. Long story short: the police have means available to them to search a safe besides asking/coercing the owner to give the code (or provide the keys or give his thumbprint or yada yada), or trying some backdoor method like getting the safe company to help out. I imagine an arc welder is involved.
Now, as to the larger question of whether or not a company is required to cooperate in a situation like this, that’s a larger matter that courts across the country are trying to sort out. As of now, the general consensus seems to be no, they are not. But that hasn’t stopped companies large and small from helping out anyway.
If I were the owner of Liberty Safe, I’d have told the cops to fuck off. Not because I’m sympathetic to Jan 6 defendants, but simply on principle. Think of it as the Fourth Amendment version of “I disagree with what you’re saying, but I’ll fight to the death for your right to say it.”