Here you go:
“Bradshaw tells us he later saw the sign a bit worse for wear, having ‘taken a beating.’ Weird. Who dislikes bison?”
And here’s the sign in question, I think. It’s on the east end of the paddock, on JFK in GGP. And it’s cast iron, I think. Pretty indestructible, IMO. It’s the color of iron oxide:
It’s a little bit lighter in color on the left side, but otherwise it looks A-OK to me, condition-wise.
Anyway, I don’t know what “taken a beating” means.