This is a clip from a post of mine from nearly three years ago which bears repeating, if you're cleaning up 1992 Wild Card NFL. It was part of the forum thread titled "1991 Wild Card Draft Surprise Card #5":
* That "Class Back Attack" insert set (listed under the NFL product) was actually distributed in the WLAF boxes, well, at least the first four cards were. The single "Surprise Card" found in WLAF boxes (similar to the NCAA BKB one above, in this thread) was a redemption for the fifth card in that set - #SP5 David Klingler. Note the "Hot Rookie" logo in the football icon, which is different from the other four
...I don't know if I submitted an IR back then, as I was fairly new to the site at the time, but I can do it now if need be.