[Chillin]

I recently bought a Star Wars Design A Vinyl Stormtrooper. I saw this in the outlet section of a grocery store. There was only one there because I was going to get two of them so my wife and I can design our own together. I bought it with the intentions to design it up and make my own cool Stormtrooper helmet... 3 days later I was about to open but I see some texts in the back of the box that says "Mock up samples - character images may change". I ended up not opening it and did 3 hours of research, but I could not find anything. I've never heard of anyone owning or collecting mock up samples. So I thought I would come here for some help from you guys and borrow some of your knowledge. I was wonder how much you guys think this is worth, and how rare is it to find mock up samples?