Interesting.
Usually when the state auctions off police cars the state requires the auction house to remove all police equipment and decals that identify the car as LEO.
Maybe the cage was exempted or overlooked because it was difficult to remove.
I think back in the day the rules were quite lax on surplus police cars unlike today.Today they mandate a repaint of the whole car if it is two tone like GSP.Too many people were buying ex two tone GSP crusiers and leaving them in that paint scheme.I called those cars MOSES because running up the interstate other cars would get over in the right lane like MOSES parting the red sea.