The form is called an OF-109 and it has become the latest center of a controversy over the Hillary Clinton email scandal. Essentially the legally binding form requires the signature of all exiting State Dept Personnel affirming they have turned over all official documents to the custody of the State Dept.   Update for video:

Hillary left her office at the end of 2012.  However, because she only used a personal email system (including server), for official State Dept business, she did not produce the documents until late-summer 2014.

Megyn Kelly and Fox News submitted FOIA requests for information of the form Hillary was required to sign.

Fox’s Ed Henry is now reporting the State Dept. has no record of the form being completed for Hillary.

Just in: Jen Psaki says there's "no record" of Hillary Clinton signing separation statement, adding the Dept is "fairly certain she did not"

— Ed Henry (@edhenry) March 17, 2015

https://twitter.com/RichardGrenell/status/577889014503501824