In late July 2014, the State Department informally requested Clinton to provide all her work-related emails from when she was secretary of state. Cheryl Mills, one of Clinton’s lawyers (as well as her former chief of staff), then had Platte River Networks (PRN), the company managing Clinton’s private server, send her and Clinton lawyer Heather Samuelson copies of all of Clinton’s emails that were sent to or received from anyone with a .gov email address.
According to a later FBI report, in late September 2014, Mills and Samuelson then ask an unnamed PRN employee to send them all of Clinton’s emails from her tenure as secretary of state, including emails sent to or received from non-.gov email addresses. Mills and Samuelson will later tell the FBI that “this follow-up request was made to ensure their review captured all of the relevant.” The PRN employee does so. (Federal Bureau of Investigation, 9/2/2016)
Although the name of the PRN employee is unknown, the only two employees actively managing Clinton’s server at the time are Paul Combetta and Bill Thornton. Combetta sent the earrlier batch of emails in late July 2014.