while in any gamefile, before selecting continue, go to downloadable content and select the season pass and download it there. Then you will get a message in you offline inbox through the serpent tome and it will have all the pieces and scythe.
Purchased this season pass from xbox live marketplace, if i do it again through the game, ill have to pay again, season pass shows up under storage under darksiders 2 in system. Not sure what to do. Also your video guides are great.