They have it for a reason and I have no doubt that the FBI is illegally keeping one too.
I have relatives in western Pennsylvania who are armed to the teeth, yet none of them own an automatic pistol, just revolvers. State law sez you can’t hunt & carry a selfloader of any length.
IMO, the big-city politics of Philadelphia own the rest of a mostly rural state. Not the only state where this is true, though.
This is one of the scarier threads I have read.
Firearms data bases are a simple fact of life today. Anytime the powers that be want a list, they can just data mine for folks who have purchased ammo or gun accessories with a credit card in the past ten years. Bingo. You have bought some 5.56 ammo and mags? It’s not a secret, not to LE.