I watched the post-launch and post-Dragon-recovery news conference.  Musk addressed this question explicitly.  The first stage did not survive re-entry; but they collected a lot of data that should help them make incremental progress with each mission.   

 :I'm sure you can find a video of the news conference posted somewhere online.  More importantly, for the article, I'm highly confident that one or more of the space media folks will have covered it in print or online.  One website that was putting links up to nearly every media mention on the Falcon 9/Dragon C1 mission was Space Nucleus; you could likely look at articles by researching from there on the day of the launch and a couple of days thereafter.  Cheers.