Amy Calistri and Tim Lavalli did a detailed investigation on this. The last article I recall seeing from them was this on February 2007. In the article they categorically state that Allen Cunningham and Jamie Gold did not receive extra chips. They do name one player who they think received 1 million of the chips but do not name the other player as the player they thought received the remaining extra chips is different than who Harrah's was going to name.
http://www.pokernews.com/news/2007/2...nths-after.htm