Sorry, they did not have the full weight of the DoJ leaning against them, but it does look like they had bad lawyers; either that or the union is lying; or both.
I'm not aware of any case where the NBPC has gone out of it's way to support agents that are criminally corrupt. From what I've seen they have done a good job at exposing government corruption in regards to enforcing immigration law. My personal experience with government corruption makes me inclined to believe that the NBPC's rebuttal is plausible.