If this were true, then these fakes should have showed up a long time ago. The timing was way too convenient to simply be the product of people 'messing with Birthers.' Heck the guy that made the one with the red background was the guy who magically knew where it came from. No, this was a deliberate attempt to discredit anything real that might come along.
The more I think about it, the more I realize we aren't talking about long time span here. All of this came at the peak of when these investigations were going on, and they didn't hit at once, most of these came out within a six month period right around the election. For the Anonymous/SA types, they play their games when the buzz is the highest.