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cmokingSGC still grades them, they think they know how to tell the difference between real and fake ones. I guess PSA doesn't think they know the difference.
REA auctioned off a lot of 4 SGC graded cards in their April 2007 auction. They have an interesting description (disclosure: I won the lot)
http://www.robertedwardauctions.com/site/bidplace.aspx?itemid=8550