The business model (at least in the US) for insurance companies is "collect premiums and deny claims" - that simple. They're not there to help us out in times of trouble, because that hits their bottom line, i.e., don't believe the smiling, wise/warm/funny actors (or CGI animals) in their ads. And, some are more ruthless about one or the other (or both!) of those operating tenets, so you have to choose with a bit of research and "eyes wide open."
I have an inventory that's never quite up to date, but close enough, and I use that to decide what to put on the personal items rider on home insurance, complete with pictures, serial numbers (if any) and screenshots of current replacement costs. I figure that's the best I can do. (And, the wife and kids have the passwords to my computers and cloud storage, so they can figure it out when/if needed, i.e., if it's a "surprise" and I haven't managed to "divest" myself of these little things by then. But, I also figure I am not going to be in a position to worry about it, and, really, it's not a significant bit of money compared to the house, say. No pre-war Martin guitars, original Neumanns, or that sort of stuff.)