Only for the record/FYI, there is growing evidence that the virus (cannot say which strain) was present in Italy months before, possibly since September 2019.
"Some people had antibodies that react with SARS-CoV2 prior to January 2020" isn't great evidence that the virus itself was present prior to 2020. There's some amount of cross-reactivity between antibodies to other human coronaviruses and SARS-CoV2.
Only for the record/FYI, there is growing evidence that the virus (cannot say which strain) was present in Italy months before, possibly since September 2019.
https://www.reuters.com/article/health-coronavirus-italy-tim...
https://wwwnc.cdc.gov/eid/article/27/2/20-4632_article