Wait, are you kidding? I'm laughing because that's
exactly where my CDC card is located in a locked drawer; inside my US Passport. That passport case is the only thing sized correctly to hold that CDC card, so I just slotted it in back of my passport.
I already own a leather passport case, and the CDC card automatically fits in it, so I won't be buying a new one on Amazon.
I've never said I haven't seen kids wearing masks in La Jolla (
they are generally younger folks for some reason). But that I go into restaurants, shops, groceries, or the Marine Room regularly without a mask and join many others who are maskless. Everyone here remains very friendly to my maskless face. It's a fun town.
And no one has ever asked to see my CDC card, in any city or county I have been to in the last six months.