Comment by lamontcg

We know they constructed Chimeras of the WIV1 SARS-1-like virus because they published it:

https://www.pnas.org/doi/10.1073/pnas.1517719113

Pretty bad secrecy.

We knew WIV1 existed as well because they published it 3 years earlier:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5389864/