Sorry, I wasn't very clear–it is in the Dragon, but it's not in the pressurised 'nose' part (which I believe is the part that's jettisoned in an emergency, but I'm not actually sure about that? perhaps I'm wrong). Instead, it was in the unpressurised 'trunk'.
"Dragon also will use its unpressurized trunk to deliver the first International Docking Adapter to enable future commercial crew vehicles to dock to the station."
See this image: http://www.nasaspaceflight.com/wp-content/uploads/2014/04/Z8...
"Dragon also will use its unpressurized trunk to deliver the first International Docking Adapter to enable future commercial crew vehicles to dock to the station."
https://www.nasa.gov/sites/default/files/atoms/files/spacex_...
They've previously used the trunk for a payload on CRS-2, CRS-3 and CRS-5. You can see a video of how it works in CRS-5 here:
https://www.youtube.com/watch?v=yXfOOIYWGF8
(Really cool video by the way!)