http://baseballcardpedia.com/index.p...ry_500_HR_Club
Card is mentioned at the bottom of this page, and supposed to be numbered to /44 like this one is.
When you say "in plastic", and chance it was put in a screwdown "brick" holder? Because that can press the card over time and make it look like the card was pressed to remove creases. Otherwise, the card may have been cut short from the factory and therefore would have gotten an MINSIZREQ from PSA, or BGS may have required it to be holdered as AUTHENTIC ALTERED.