I think the lab origin is almost for sure. WIV released the RaTg13 sequence which is the closest to the covid virus. They had got samples from the patients who

I think the lab origin is almost for sure. WIV released the RaTg13 sequence which is the closest to the covid virus. They had got samples from the patients who was infected by RaTg13 back in 2013. But they have never released the sequence, which could be a direct proof, or at least can bridge some gap.