Actually part of the genome of RaTG13 was published as RaBtCoV/4991 back in 2016.
Some people suspected it [0] and eventually Dr. Shi confirmed it [1] after.
[0] https://www.researchgate.net/publication/341547726_Understan...
[1] https://science.sciencemag.org/content/369/6503/487.full