Learn, Son
https://www.archives.gov/publications/prologue/2016/winter/presidential-transitions
Moving Out, Moving In
The National Archives’ Important Role When the Presidency Changes Hands
Throughout the fall and winter of 2016, the National Archives staff has been working with the White House staff to provide for the orderly transfer of records while assuring that the records necessary to conduct the country’s business remain accessible.
In addition to managing the presidential records created in the White House, the National Archives has the responsibility to assist each of the executive branch departments and agencies in managing their records. At the end of an administration, these agencies face records management challenges as senior political appointees leave the agency.
Today, it is clear that the records of senior officials are official government records; however, this was not always the case. The records of many past cabinet secretaries are housed in the Library of Congress, in academic libraries, and in private collections.
A more complete reference with better detail;
https://www.archives.gov/records-mgmt/faqs/general.html
On another note, there has been a claim that a statement went out from the GSA that clarified;
However, I have been unable to locate the source publication other than citations to the above statement.