1996 SP Football Forum

i have 2 cards #162- Lawyer Milloy and #168 Vinny Testaverde- that have brown backs instead of the silver, The card is the same front and back except for the backs have the brown and the fronts are not as colorful  and kind of washed out and don't stand out destinctly like the silver backed cards.  On the back of the cards there is a shadowy image over the picture on the back.  There is also a rectangle box that is empty like on the front.  Was this a different set?  or was it just misprint.