This article is from the Toys FAQ, by firstname.lastname@example.org (Scott Gordon) with numerous contributions by others.
From the rec.arts.sf.starwars.collecting FAQ:
"MOC = mint on card. This means the figure is in original
unopened package. If there is any way the figure could be
removed or has been removed, then it's *not* MOC. MOC says
nothing about the condition of the card, which is the most
important factor in the value of carded figures."