I wish. I have a list of guns I have to update so my insurance will cover them if something happens. So no, I can account for any gun I own.
I have a few in the "trade/sell" stable. I don't list those on my insurance. My insurance agent is a nice guy,but I don't want to see him every week.
As far as this comment "The moment I can't account for a firearm is the moment I need to give up the collection". You just don't have enough to forget one.