Only because I've just finished a VERY good book that is a clear summary of Mongol history, David Morgan's The Mongols. In discussing Polo as one of the several sources for our western knowledge of the Khanates, he states

"Marco Polo evidently learned no Chinese, which suggests that his contacts with the bulk of the population were very limited. No trace of him has ever been found in Chinese sources, despite a number of false alarms. This may partly be because he seems to have exaggerated his own importance as a Yuan official in order to impress people at home in Venice. He claims that for three years he was governor of Yang-chou, but this was evidently not the case." The Mongols, p. 130.

Of course, I believe Morgan says elsewhere that hardly ANY visitor from the west made enough of an impression to show up in the meticulous bureaucratic records of the Chinese!