He already had that; it's quoted in the newspaper article. The problem is that no specimen of such a pink slip can be found and there is no real archival evidence of the veracity of this; absent some evidence, it would be taken as anecdotal only. Of course, if the papers were blank, there would be no hope of someone having saved one. (And why blank slips anyway? They couldn't put it into words if you were being fired? Makes the whole story sound unlikely.)