I should have been more specific - my apologies. I did provide them with a list, manufacturer, model and estimated cost to replace because they asked me what at the time what "everything" related to my collection was worth. They did that to help me select the proper coverage and quote a price. Plus, I honestly at the time, did not know what I had so I did the inventory list more for my benefit.
They also have other policies that don't require a list you simply tell them the value and they quote you a price with "qualifications." I did not investigate that as I had prepared the list.
Just and FYI, after speaking to TCA, LOTS, my insurance company, people in the industry and a few lawyers at my club - list and pictures made sense.
If your concerned with insuring your collection, call your company, some companies, like mine, will not insure collections of any type. This means if I suffered a disaster like a fire, they will not pay me even though I have the list. I asked about adding a rider to my HO policy, they immediately told me that was not possible NOT so they directed me to American Collectors Insurance.
I am not an insurance agent or affiliated with any insurance company. I found this stuff out via research, from the forum, from people who lost items due to flooding, hurricanes, super storms, etc. You need to do your homework.
What I did find out is that American Collectors Insurance knows how to deal with "collectors." They have different policies, with different requirements and you can work out the details with them. For example, you could select a policy called Collection (Limit) Deductible + Collectors Choice (Options) + a deductible or - a deductible.
One other item, the cost, depending on your financial status can be pricey or not.