Wuhan is a very large city in Central China and a transport hub. So it at least sounds plausible that the virus might have been carried there by someone, though I don't know how plausible it is that (if that's what occured) it did not seem to have left a trail of contamination (or perhaps it did but we don't know...)

Also, I believe that the first recorded outbreak of SARS was in Guangdong while the origin of the virus was eventually found to be in Yunnan, 1000+km away.