Yesterday's post office stabbing-yes, we had one of those! In which a boy from Avenue D who loved pigs got stabbed either randomly or less so on the steps of the giant post office that will never become Penn Station-was documented by an apparently philatelically-inclined German tourist. This tourist begged for anonymity from the papers (as he now realizes when you stick your neck out in New York, we stab that neck). But New York Post photog G. N. Miller was there to snap Herr Dolph Himmlerstein, or whatever his real German name is, for posterity. (Psst: He's the white one!) Thanks, Posties! Now, Internet: please identify this German so we can find him and make sure no good deed, or at least no act of compulsive documentary, goes unpunished.