CNN reports that a Frenchman named Amirouche Hammar had Covid-19 in December in Paris. This was supposedly discovered after old samples were re-checked for the Covid-19 virus.
Alas there's hardly any detail in that news report besides the fact that Hammar went to a hospital with a dry cough and (eventually?) coughing blood. There's nothing said about his travel history for example.
Insofar, I think the first (previously) confirmed case outside China was one in Thailand on Jan 13, according to the WHO:
13 January 2020: Officials confirm a case of COVID-19 in Thailand, the first recorded case outside of China.
So is there anything that can corroborate the scant account from the CNN report? Did Hammar have a travel history? Is the virus sampled from him close enough to the original Wuhan samples (vast phylogenetic trees of Covid-19 have assembled by now).
Alternatively Hammar's sample(s) could have been contaminated later... (E.g., even the CDC had a notorious problem with something like that.)