3. The coronavirus was present in the U.S. weeks earlier than scientists and public...

The coronavirus was present in the U.S. weeks earlier than scientists and public health officials previously thought, and before cases in China were publicly identified, according to a new government study published Monday

I haven't seen an answer to your question, so here it is (based on what i know about antibodies), there's "a thing" called passive immunization that can occur by being near someone with the antibodies for the virus (previously infected) or by having it naturally (being born with it), also passive immunization can be achieved by consuming food that has the antigen for the desease (there's a lot of studies dating from 2018 about this) or by inoculationg convalescent serum into your own blood, so, it could be possible that some people had access to any of these types of exposure to antibodies.
Passive immunization is a good way to try and prevent having a disease or showing severe symptoms.

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