Only if you have a xbox branded hdd for xbox 360
Mine did not. It seems to be pretty hit and miss with Game Stop as to whether or not you get the manual. I have had some games come with it and others not.
Yes all original Xbox games will play on Xbox 360
Yes it came in original box
Yes, but not Xbox one
I received the original case but depending on there stock you might get a cheap case
Not yet but will be very soon!
It's pure luck I'm sorry to say. You may get the case with it, if they don't have any cases, you just get it in the generic gamestop used game sleeve.