Yes, they are checking.

I traveled back from the US on Monday, filled out the required forms online and on the plane.

Two men arrived at my door today (unmarked car, not in uniform), presented police badges, and asked for my passport and documents. Asked where my husband was (he's staying with family elsewhere) and reviewed the rules and penalty for not complying with quarantine (10k).

One of the gents was wearing a Florida t-shirt, which I thought was funny. He did not. They took my trash out for me, so that was nice.

Just an FYI