I have a Grocery Store display that has four free posters from The Empire Strikes Back when you buy Crisco, Duncan Hines and Pringles. The display is still in the shipping box and was never used. The postage date is July 7, 1980. There are 30 each of four different posters. I plan to sell on Ebay but want to know if I should sell Individual posters or sell the display as a whole. What is a starting figure I should ask