Posters and adverts of rides- what happens to them?

recently, I was walking around BGW when I kept seeing these huge banners of Verbolten. They look pretty interesting as well as sleek, with some nice artwork on them.. so I went to Guest Services to ask aout what happens to the posters and adverts of a ride thru the park? No one seemed to know.
Does anyone know what happens to those posters and adverts? Do they end up in the trash or in some forgotten bin? How do I obtain one from the park?
Always, Stredain