Maybe it leaked from a US lab? Blood samples from the Red Cross blood donor program show that it was already in 9 states in the US by mid December 2019.
"It is not possible to determine whether the potential SARS-CoV-2 infections suggested by this study may have been community- or travel-associated. A previous survey of blood donors, conducted to help understand travel practices, determined that less than 3% of respondents reported travel outside of the U.S. within the 28 days prior to donation, and of those reporting travel, only 5% traveled to Asia."
"It is not possible to determine whether the potential SARS-CoV-2 infections suggested by this study may have been community- or travel-associated. A previous survey of blood donors, conducted to help understand travel practices, determined that less than 3% of respondents reported travel outside of the U.S. within the 28 days prior to donation, and of those reporting travel, only 5% traveled to Asia."
https://www.redcross.org/about-us/news-and-events/press-rele...