People were concerned about lab leaks from that particular lab in Wuhan (the one close to the market where it supposedly started) before covid. The research on this type of virus was happening at this lab, they had posted a job opening for a researcher some time before.
All the Trump hate going around (an the willingness to go against all-things-Trump) at the time, clouded massively any actions to properly identify the origins and even some preventive actions.
Any traces that could only be identify at the time are gone by now, and as time passes, we may have more information but probably less concrete evidence. Sadly the world may end up with only theories