If it came from a lab, it could probably be mutated from SARS-COV-1 or MERS-COV, as both of those were the most notable viruses that would be being studied in a lab. Instead, the virus appeared to come from the same lineage as wild viruses in the area. There's obviously a CHANCE that it could have by coincidence acquired all those same mutations as the wild population, but its so ridiculously small that it can be thrown out as signficiantly impossible.
If it came from a lab, it could probably be mutated from SARS-COV-1 or MERS-COV, as both of those were the most notable viruses that would be being studied in a lab. Instead, the virus appeared to come from the same lineage as wild viruses in the area. There's obviously a CHANCE that it could have by coincidence acquired all those same mutations as the wild population, but its so ridiculously small that it can be thrown out as signficiantly impossible.