Not sure if that will surface.
However, I found this to be interesting.
http://www.cnn.com/2013/05/14/politics/irs-conservative-targeting/index.html?hpt=hp_t1
Now these details don't absolutely rule out what it was that you were saying, but it certainly weakens that argument. For one, we are talking about multiple offices were targeting conservative groups. Secondly, when they revised the original search criteria of "tea party" and "patriots", they then revised it to "political action-type organizations involved in limiting/expanding government, educating on the Constitution and Bill of Rights, social economic reform/movement."
We know that the new criteria certainly implies that they are searching for conservative groups, if it was an honest mistake, they would of at least included along with the original or secondary criteria with key words such as "progressive", "middle class tax fairness and reform" or whatever key words that would smoke out any progressive groups.
The searches were done exclusively to target conservatives.