[ceejayoz]

Because you don't want a direct photo of a top-secret document laying around, they cover it and document it as such.

(There were even so many to cover they had to make extras, which because they were hand-made, didn't get removed as is apparently the norm during processing.)

> “The investigative team used classified cover sheets for that purpose, until the FBI ran out because there were so many classified documents, at which point the team began using blank sheets with handwritten notes indicating the classification level of the document(s) seized,” the prosecutors wrote.

> “Any handwritten sheets that currently remain in the boxes do not represent additional classified documents — they were just not removed when the classified cover sheets with the index code were added,” Smith’s team wrote. “In many but not all instances, the FBI was able to determine which document with classification markings corresponded to a particular placeholder sheet.”

Your article does not assert what you claim.