I read some conjecture on confiscation the other day and it was proposed that they know going door to door won’t work. Instead, since they know who has guns and who doesn’t, they will call for voluntary surrender. If you don’t then they will start taking away privileges. You get a letter that your driver’s license will not be renewed, that your kids don’t qualify for student loans, etc. There are thousands of ways they can mess with you until you comply.
... since they know who has guns and who doesn’t,...
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That’s only true in some locales or applies to guns purchased after the mandatory paperwork for a background check.
I have only inherited guns and guns purchased before the background checks began.
There are many other gun owners like me, where the gov’t. can’t possibly know the quantity or types of guns owned.