Not a very imaginative article... In the smallest state in the union I could hide a dozen rifles and 10,000 rounds of ammo so they’d never be found other than by me.
Where I live you can sell guns and ammo over the internet classifieds. It means they don’t know who still has the gun they registered and who now owns it. Without a search warrant, how do they “find” the guns of a person who says he sold them years ago?