Board Thread:Metal Gear Solid V/@comment-93.186.153.226-20140505104522/@comment-1504072-20140505105259

I don't think you have access to any of Chico's tapes at the start, so I believe they're intended to be listened to after completing the Ground Zeroes mission. I think that's the best way as Big Boss should gradually discover the truth of what happened there as you progress in the mission, and then the tapes fill in the blanks. Also they have spoilers.