I have whats called a Marine Rider added to my State Farm homeowners policy. It started with a set value for my firearms, and the value increases with inflation. The premium is about 150 a year for 35k coverage. While it wasn't required, I did come with a list of firearms and serial numbers to initially come up with a value worked out with my agent. We used blue book of firearms, and various completed actions found online to get values for the more rare ones in my collection. Again, it wasn't required, but my agent suggested letting him keep the list in my file, and he assured me State Farm would not, and does not, require that list to be forwarded to them...and last time I updated the list with him, he still had the orginal handwritten list I gave him years ago...we just added and deleted changes by hand..and it went back into my file.
While I'm never comfortable with any entity outside my family having a list of what I own (and the possibility that State Farm would forward that knowledge to big brother if he asked), I do trust my agent...as he too is a gun guy. He also told me he would inform me if State Farm ever wanted that list...so I'd have the option of dropping them to protect my list...but almost 15 years now that hasn't happened.