I got to thinking, if Comey surrendered his computer to Mueller, then it is possible that Comey no longer has direct access to his memos, and this feat accomplished by surrender of property, not by destruction of a digital record.
..."Mr. Steiner wrote in the diary that senior advisers to Mr. Clinton wanted the agency to remain under the control of a political ally. He wrote that Mr. Clinton had become angry when he learned of Mr. Altman's recusal..."
Treasury Official Is Disavowing Whitewater Details in His Diary
Consistent obstructive by the Clintons and their minions spanning decades.