Re: Gradient Mesh Tool - 3D Box (illustrator CS5.5) by Vincent Rosati on Oct 29, 2012 at 1:30:26 am
Probably a bunch of ways you could do this. My initial thought would be to use the Appearance panel to add new fills to the object.
Select an object in the attached file and open the Appearance palette, the effects used on each fill are available. Also look at the Transparency palette for the fills.