I think HRC kept a thumb drive with her running Outlook .pst file. “I want my email to be just like I left it anywhere I go”, says HRC in a fake quote. There could easily be multiple copies and likely are. SR picked one of these up and gave it to Wikileaks. Just my theory.
Sorry, no. What SR passed on to Wikileaks were DNC emails, not HRC emails. HRC emails were never published. They were sought in FOIA requests, but Hillary took bleach bit to them, and some hammers. Trump jokingly asked the Russians to let us have them. Lots of foreign governments, and the NSA, probably have them, but they haven’t been released yet.