The Barcelona (Spain) sewage treatment plant folks collect daily samples. At some point in mid-2020, they went back and did tests over the samples.
They went past January 2020, and deep into 2019. So this odd thing comes up. They have a sample from March 2019, with Covid-19 showing up in the sewage....meaning some sick folks flushed their toilets.
The date stuck with me, because I was actually in Barcelona around this time period (Mar 2019)...spending a whole week there. A lot of Chinese tourists were around, that much I can swear to.
I would go and suggest that whatever breakout occurred at the lab business, probably was around Chinese New Year in 2019 (5 Feb), and that locals people were getting infected in Feb/Mar, and some were making the trip to Barcelona (and probably other European cities like Rome and Milan).