We have written confessions of systematic grave robbing from the time of the Pharoahs, and successive generations of Pharoahs came up with ever-more-elaborate schemes to make tombs more difficult to break into, none of which succeeded.

Finding Tutenkhamen's tomb that hadn't been systematically cleared of all its contents was unprecedented but owed nothing to being protected by any elaborate superstructure that needed destroying, and everything to do with it being concealed by mudslides and workers' huts rather than the sort of superstructure graverobbers were used to partially dismantling to find a way in.