Which set do you have? The blue, red or Coca Cola red box? The blue factory sets contain 1992 (or maybe 1993, they all look alike) Leaf Preview cards which are basically worthless, but the red factory box contains Donruss Update cards, which are pretty rare. The Coca Cola factory set just contains cards from (or the whole) 1992 Donruss Coca Cola set which is also practically worthless.
If you have the red and happen across the Dave Winfield update card, I'm interested. I tried my hand at one of the red sets (for like $8) and only got the Gary Carter and a couple of commons.