As I explained above, information in the redacted affidavit. Specifically,
"The NARA Referral stated that according to NARA's White House Liaison Division Director, a preliminary review of the FIFTEEN BOXES indicated that they contained "newspapers, magazines, printed news articles, photos, miscellaneous print-outs, notes, presidential correspondence, personal and post-presidential records, and 'a lot of classified records.' Of most significant concern was that highly classified records were unfoldered,
intermixed with other records (emphasis mine) and otherwise unproperly [sic] identified."