In an audio recording provided to Big League Politics by a source that currently wishes to remain anonymous, journalist Seymour Hersh confirms that Seth Rich had contacted WikiLeaks with sample emails from the leak. Hersh cites an FBI document as proof for his claim.
http://bigleaguepolitics.com/audio-seymour-hersh-states-seth-rich-wikileaks-source/
http://bigleaguepolitics.com/audio-seymour-hersh-states-seth-rich-wikileaks-source/