The reason I believe it came from that lab is that China reacted so frantically to it. Were it one of the regular viruses that sweeps China from time to time it would likely have been pretty much ignored. Peking feared that it was much worse than it is turning out to be, even in China with the population’s really bad public hygiene.
Yes, it does seem that it most likely came from a Wuhan area biological lab. The drastic Chinese government response would support that. Bet the US government knows more on this than they are publicly says, which is why they immediately discouraged travel, then banned travel. The problem is that we’ve not sealed our border completely and implemented quarantine of all arriving travelers. Us and everyone failed on this so not we have it popping up around the world and in more places in US. We need stricter quarantine and seal the borders and ports. Trump should use the excess funding to build the wall, a win-win, especially now that there are cases of Chinese Wuhan Coronavirus just across the border in Mexico.