- If there was any hard evidence actually proving they had SARS-CoV-2 in the lab before the pandemic, it will be long gone. Only an independent full access forensic level investigation would ever find any sign that evidence was destroyed, and that is never going to happen.
- It seems extremely unlikely to me that anyone from within China will A) blow the whistle or B) that we would hear about it.
- If a whistleblower were to escape the country, China would be able to claim they are lying, and it is a plot by the West to oppress the Chinese people etc. The chance that the whistleblower would be carrying irrefutable evidence of a lab leak is again almost zero.
We can keep shaking the tree, but I don't think anything truly satisfying is going to fall out. Consider that even if the USA for example had actual evidence of a lab leak, they would be better off using this as leverage over China secretly than releasing it publicly.
What actually can and should happen, is that some major change comes to virology research to absolutely minimise the chance of another lab origin pandemic. Wherever SARS-CoV-2 came from, we have had lab leaks before and we will have them again, that much is certain.
At the end of the day the only people who most likely know whether it was a lab leak or not are the chinese authorities. So we will likely know in 50 or 60 years if those archives are made public (like for the Katyn massacre). The CIA/NSA can possibly get its hand on incriminating communications, but who is going to trust those guys?
Also I wouldn’t be surprised to learn that the chinese authorities got all covid lab samples destroyed without being analysed. The best way to not leak that you may be responsible is to ensure no one, even yourself, can ever know whether you were responsible.