Its what got Oppenheimer fired for leaking nuclear bomb secrets back in the day
The method is easy, simply leave classified information unsecured and allow interested third parties to review it.
In the case of mishandled burn bags, if the information in the bag disappears, who will know it did not get burned if it is stolen and certainly all finger prints will be destroyed if destroyed so there is no proof of third parties sifting through it before destruction
For example, Huma’s habit of leaving secret briefing books lying on the bed of her unlocked hotel room (how can that happen) while out of the building in meetings
“Humas habit of leaving secret briefing books lying on the bed of her unlocked hotel room (how can that happen) while out of the building in meetings”
I think that was in a text or a call between Huma and a staffer. He was looking for the docs and she said something like, “They’re on the bed in the hotel. Just go get them; the door is unlocked.”