I'd be really calm and clear with your supervisor, that you won't be getting the jab, and that you won't be subjected to testing. That it's non-negotiable, and they'll need to do what they need to do.
Or you could lie, say you got it at one of those mobile clinics, maybe a couple counties over, and you lost your papers. But, then you'll just end up having to lie again 6 months later when it's booster time.
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