You're correct that the immediate host animal hasn't been found. But that problem also applies to the lab leak hypothesis, since there's no evidence in the geno

You're correct that the immediate host animal hasn't been found. But that problem also applies to the lab leak hypothesis, since there's no evidence in the genome of SARS-CoV2 that it is an artificial virus. It is in fact over 95% similar to similar viruses isolated in the wild. The first patients were all associated with the market, and genetic evidence shows that the virus was circulating there for weeks (at least) before the first recognized case of covid. That is consistent with what we now know, i.e. that most SARS-CoV2 infections do not lead to severe disease.