We can trace mutation histories of viruses very extensively, the tools and techniques for this are now pretty sophisticated, so that's not necessarily an insurm

We can trace mutation histories of viruses very extensively, the tools and techniques for this are now pretty sophisticated, so that's not necessarily an insurmountable obstacle. There is a probabilistic aspect to this though. If we happen to find the exact wild virus population Cov-19 originated from (whether it then mutated naturally or in a lab) then I think we'll nail it. On the other hand if we just find an adjacent population that diverged from the actual Cov-19 source some time ago it could be harder to pin down the route.