Maybe not today with the internet and the speed at which this stuff gets out. Things get hacked and documents leak digitally which is way easier than someone breaking into a physical building and riffling through old documents. Additionally as we have seen with Trump, Biden and Pence it appears that the way the administration deals with secret documents can be quite sloppy.
Yes, it seems really hard to keep things secret. I guess it would be easier for a country known to kill journalists (thinking of Russia here, Assange is alive).
And everything is recorded nowadays.
(people like Biden are great security risks)
