In some places, old records never die, but they aren't always kept "alive", let alone current.
I lived in New York State, until 1979. I had a pistol permit. Pistols were listed on the permit, by make, caliber, serial number, and barrel length!! (never did get what barrel length was useful for...)
Father's and Mother's pistols were all listed on all our permits. We did this after an auto accident in the mid 60s, when we learned an unpleasant truth.
If Dad had died, and no one else in the household had his pistol on their permit , then the guns would have to be surrendered to the state. The State police would hold them for 30 days, then destroy them, even if a permit was applied for. The Sherriff would hold them until the permit was either approved or denied. SO, everyone in the family got a permit, including us boys when we turned 18, will all Mom & Dad's pistols listed on them, so the state couldn't steal them in the event of a family tragedy.
But, old records never die, it seems. In or about 2001, I got a letter from Saratoga County. First, it informed me that, since I was no longer a NY resident, (apparently they just noticed me leaving the state in 1979) my permit was no longer valid. ok, fine, ...whatever..right?
BUT they also said they wanted it BACK! That's right, they wanted me to return the wallet sized, NON-laminated piece of paper (not even cardstock, but paper) that they issued back in 1975!
And to top it off, they wanted to know (I'd say "demanded" though the language was polite and contained no overt threat) they wanted to know where the pistols listed on my permit WERE!
My reply won't pass TFL language filters, so I won't quote it here, suffice to say "go pound sand" and "take a flying leap...." cover the jist of it in more polite fashion...
So, here's something to consider, if you live in a place where the State has a list (or partial list) and they order your guns seized, and give the police that list, how do you think they will act, and how "hard" will they search for a gun or three that you haven't owned for 20+ years, if the state list says you own it???
If you don't have immediately available (and acceptable) paperwork "proving" you don't have the gun any more, I doubt they'll take you at your word. If you have a really zealous enforcer(s), they could take your home (and every other property you own) apart, brick by brick, stone by stone looking, and not in a careful manner.
They aren't required to leave things in tidy order, in fact, they aren't required to leave things in a condition where they can be put back together, or even repaired. You could, literally, be left with a pile of rubble for a home, (and a car!!!) without restitution until a court rules you are entitled to compensation, which could be months. or even years. AND, even when you do get a check for your damages, it will be THEIR estimate, and may not cover all your costs...
its not a good thing. It should NOT be law, but until a court rules it invalid, it is the law we have to live under.