Unlikely. Obama would have gotten to it first. Granny was a shut-in for years before she died the day before the election. Obama last visited her in late October 2008. If you recall, folks on this forum were joking around about how he was mopping up any loose ends document-wise. Chances are, any mopping up took place years before that.
Also, consider that before 2004 at the very earliest, no one would have attached any value to the document, even if they had seen it.
Obama was not at grandma’s long enough to go through a life time of papers. That birth cert. could have been stuck in a bible or a copy of Mao’s little red book. Also, Stanley died and someone could have coped that document from her papers.
Who knows?! Not us, at this point.