Clare [Middlemiss, secretary to David O. McKay] was so protective of President McKay that she even went so far as to prevent certain members of the Quorum of the Twelve from seeing him or having access to him, permitting it however to others. ... My friend says Clare told him that she was fired the day after President McKay's funeral, and was very bitter about it. Bitter especially against Presidents [Harold B.] Lee and [N. Eldon] Tanner. She says she left, in the vault in the basement just below her office, 80 volumes of President McKay's diary, all annotated, indexed, etc., and 130 scrapbooks of clippings, also indexed and annotated. Presumably they are still in the vault.
[Source: Confessions of a Mormon historian : the diaries of Leonard J. Arrington, 1971-1997, Gary James Bergera, editor, Signature Books, 2018]