one single key for the collector´s pack:
Men of War: Assault Squad
Men of War: Assault Squad - MP Supply Pack Alpha
Men of War: Assault Squad - MP Supply Pack Bravo
Men of War: Assault Squad - MP Supply Pack Charlie
Men of War: Assault Squad - Skirmish Pack
Men of War: Assault Squad - Skirmish Pack 2
Men of War: Condemned Heroes
Men of War: Red Tide
Men of War: Vietnam
Men of War: Vietnam Special Edition Upgrade Pack
Men of War

Note:it would be more worthwhile if you are missing more than just one, but anyone can enter just for Vietnam