It is additional playing material that is used when 3 biohazard stickers were pasted on the board. The package was in the Spielbox magazine 05/2011 (apparently German edition only), but also named on the rules card as "Essen Spiel 2011" giveaway. An English print-and-play version is available here in the the Downloads section. Card back mismatch does not affect gameplay. SPOILER ALERT! (don't continue reading if you don't want to know the content details) This small card expansion contains 5 soldiers for the draft cards. The soldiers work for all factions and will be played with the normal draft card rules.