I'm looking to buy this game lot http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEBIDX:IT&item=270423838498 but I'm reluctant to buy it because the main games I want (CoD 5 and GoW 2) don't have a case and manual.. I just bought my Xbox 360 today after watching my buddy play Gears of War before the UFC match yesterday and desperately want the game but do I need the manual for the maps that you buy from the marketplace? Is there some sort of key for each specific disc? Any info would be much appreciated.. thanks in advance..