Were they really a thing anywhere? I traveled to 22 states Mostly deep blue) the year of the lockdown and was never asked for one.
All I ever had to do was occasionally give a restaurant my name and phone number for tracking purposes.
I wonder how many others gave names like Jim Madison and Tom Jefferson
I think some of the bigger cities had them, or you had to show a vax card to get into certain venues like restaurants and bars. Cook county did this in January of 2022..