I know someone who is medically confirmed to never had covid:
https://www.thelancet.com/journals/laninf/article/PIIS1473-3... Here, we report on a 62-year-old male hypervaccinated individual from Magdeburg, Germany (HIM), who deliberately and for private reasons received 217 vaccinations against SARS-CoV-2 within a period of 29 months (figure A; appendix 1 tab 1).
[snip]
Furthermore, HIM had no signs of a past SARS-CoV-2 infection, as indicated by repeatedly negative SARS-CoV-2 antigen tests, PCRs and nucleocapsid serology (figure A; appendix 1 tab 1).