As you can see with your own eyes, the numbers for Slick Rick sales doesnt leak out that often. The numbers are the numbers people have been speculating in. Notice that this is the US-sales, the sales worldwide remains worldwidely unknown.

Exept for the already mentioned albums, Slick have also collabed on many other arists albums.

So Fresh [1999]	Will Smith, Biz Markie and Jazzy Jeff	Willenium
Got To Give It Up [2002]	Aaliyah	One in a million
Sexual Healing Remix [????]	Snoop Dogg	????

The Show/Ladi Dadi and some other tracks originally made as singles with Doug E. Fresh is not counted as they are in one/some of the solo albums. Notice that the list is far far far from finished.