raccoondogs

That's what happened with H1N1 but we know that hasn't happened with Sars2 because Sars2 only spreads efficiently with a furin cleavage site but the furin cleavage site also makes it more pathogenic so it would definitely not spread undetected.

That's not correct. There's evidence of genetic engineering in the genome of the virus. There's a 2018 DARPA DEFUSE proposal from scientists at WIV/UNC/EcoHealth Alliance which essentially predicts what SARS-COV-2 would look like.