Most of the original Jordan fakes were easy to spot, because of the use of only one yellow shade in the Fleer streamer. Real ones have two shades of yellow, one for the straight "Premier" part, and another for the arrow part.
1986-87 Fleer - [Base] #57 - Michael Jordan [BGS*8]
Courtesy of COMC.com
Did you even compare it prior to grading?