The Chinese published the genome sequence a long time back, I think very late 2019 early 2020, (corrections welcomed)
When my spouse sequenced 46,000 base pairs, both directions, of glucose-6-cerebrosidase and Metaxin (codes out in the opposite direction but the overlay is non-contiguous), it took years by hand with ultracentrifuges spinning for a day or so, toxic ethidium bromide, radioactive markers and X-ray films to hand count A,C,G,T using a ruler and pen and paper
Now you can sequence in day or less
When you insert a genetic sequence it leaves a fingerprint due to having insertion sequences at both ends and the one you want inserted in the middle,
a "fingerprint" so to speak of "Hey, here's a marker next to an inserted set! look at me!"
the technology has gotten a lot better in 25 years or so and the tools better and more precise, but when you look at the various mutants they know where and what is different.
You better believe that a lot of labs would report "hey, here's something anamalous and weird, quick publish and get this out there!! and others looking too.
I'm personally fairly confident Covid-19 is natural in that it jumped from a wild animal to humans and not genetically engineered, since you can read about the variants and a lot of labs are monitoring this nasty stuff
I'm also fully vaccinated with Moderna and am looking forward to boosters probably yearly, perhaps the planet is trying to "thin the herd"