The RIAJ reports today that (miss)understood has indeed shipped over a million units in Japan. Sales may in fact be much closer to a million than the oricon charts had everyone believing, as some stores are lax in their sales reporting - especially around the new year's holiday release of the album.
However, it should be noted that the oricon still has (miss)understood sales at around 850,000 units - we'll have to see how things change in the coming weeks.
It should also be noted that Ayu's 2003 release A BALLADS is considered a million-seller by the RIAJ but not the oricon charts.
SOURCE:
http://www.ayu-mi-x.com/
http://www.riaj.or.jp/data/others/gold/200601.html
ORICON HAS DECIVED US