I'm going with posed as well...for the following reason.
My Dad found the bodies of two bucks locked up(I still have the horns) .One of the dead bucks was in excellent shape, the other was in real rough shape ....skinny ,hair all matted etc. The one that was in good shape died of a broken neck, the other from exhaustion and starvation(trying to drag the other around).
Very unlikely that they would all three die at the same time .
Five husky men couldn't pull the horns apart but a couple of years later fell apart when they dried out .