Mutations do not happen in the lab today. You synthesize the virus and add parts from other virus and afterward check whether it works. E.g. some short chains of an aids virus have been added to CoV-19 and other stuff that make it impossible to happen in nature.
As I said: Once in a universe live time chance this virus (CoV-19) is from an unknown animal.
And people who are experts say that it is impossible for this to be man made as it should contain much more well known dna sequences. If what you say is true the experts
should know that, and still they maintain it's not human made and you should find more of the sequences. It's all a conspiracy theory.