I know precious little about the leaker but I have one clue: they use Gorilla Tape. Seriously, some of these documents are sitting on said tape. Only barely in frame but the colors and logo are unmistakable. I would screengrab to show you but these docs are marked top secret and I am not fucking with that.
https://www.nbcnews.com/politics/national-security/leaked-documents-show-us-spying-russia-war-ukraine-rcna78876
https://www.nbcnews.com/politics/national-security/leaked-documents-show-us-spying-russia-war-ukraine-rcna78876
