I have a couple of full-sized unused concept for the film Leap of Faith for which I paid almost nothing ($5 dollars each). I didn't realize and the seller forgot to mention that they were stuck on boards. They arrived in a triangle tube, with the photographic style posters peeled from the backing, but leaving the 'sticky stuff' all over the backs of posters. I had to keep them back-to-back so that they wouldn't stick up anything else...
They did include a 4 x 6 inch piece of the backing board that had the IKON graphics production information on it in the tube.