

Publishing classified information, no matter how innocuous or unharmful, is still illegal
Citation needed.
https://en.wikipedia.org/wiki/New_York_Times_Co._v._United_States
https://supreme.justia.com/cases/federal/us/403/713/
We’ve got pretty good case law to show that freedom of the press goes pretty far, and that since the public has a pretty clear interest in the information it’s pretty much a given they can publish it.
If they prosecuted the Atlantic for it, they’d also need to hold that whoever sent them the classified information was guilty of the same offense.
Have you read the messages? According to the person who decided not to publish them there was stuff potentially more significant.
War plans being accidentally sent to a journalist is intrinsically in the public interest.
I was unaware the classified information being “boring” was a good reason for a news outlet to self censor.
Also… The Pentagon papers were literally just “boring war plans”. War plans often contain motivation and desired outcomes, which are sometimes big news.