On October 2, 2015, the State Department the department sent a letter to Clinton’s personal lawyer David Kendall, making “an additional request for any records that former Secretary Clinton may have in her possession,” especially from her first two months as secretary of state. This is due to news reports in September that additional work-related emails between her and Army General David Petraeus from her first weeks as secretary of state were found. (McClatchy Newspapers, 12/31/2015)
On November 6, 2015, Kendall replies in a letter, “With regard to her tenure as secretary of state, former Secretary Clinton has provided the department on December 5, 2014, with all federal email records in her custody, regardless of their format or the domain on which they were stored or created, that may not otherwise be preserved, to our knowledge, in the department’s recordkeeping system. She does not have custody of emails sent or received during the first few weeks of her tenure as she was transitioning to a new address, and we have been unable to obtain these. In the event we do, we will immediately provide the Department with federal record emails in this collection.” (US Department of State, 5/25/2016)
Note this suggests the possibility that Clinton or her representatives may still possess some copies of her emails.