Colt Express: Rock Promo Accessory

A promo from the 2016 Easter Basket (Brettspiel Osternest). It consists of a small folded board with the following instructions: "This Rock decoration can be used to place your common deck during your Colt Express games, with or without the third expansion < Indians & Cavalry >, due to be released October 2016. It's purely aesthetical and forms (just as the cardboard rocks and cactii) part of the scenery.