I saw today on Japanese TV that China reportedly doesn't count asymptomatic people who tested positive as of the 14th of February, and that there might be 40k+ of those.
- never tested asymptotic people - in the first weeks, didn't tested anyone unless they had symptoms AND came back from China or Italy - now only takes care of serious cases, which means that if you have mild symptoms you don't get tested
Official numbers a way, way lower than reality.