Not going to happen, though not for lack of tyrannic desire.

There are 10s of millions of people who have not been vaccinated.

A few hundred or a few thousand Feds are going to visit every one of them?

Some of LIEden's peeps are smoking something wacky!

AFAIK, vaccination records are kept by states rather than the Feds. How many states would cooperate with such a tyrannic venture?

And if they try to blanket random neighborhoods?

My habit with solicitors is to close the door on them before they finish their first sentence. Were a Fed visitor to get far enough to identify themselves, I'd ask to see their warrant. And shut the door a second or two later, because they wouldn't have one.