They don’t even ask for that where I went. I am in group 1a but was never asked to prove it, never showed ID, and when my boyfriend became eligible a week later, same deal. They sign you up with MyChart right there with your name and DOB and email, takes seconds. I have Kaiser insurance so I’ve never been in the MyChart system. Then you download the app later and sign in and have your proof of vaccination. I volunteered two weekends at the Convention Center downtown in my city where 3k vaccines a day were administered and they never asked for anything at all or allergy history. Technically, anyone could have driven up. You are only asked “Do you have an appointment?” at the entrance as you drive up and are never asked for ID.