Did you read the search warrant application? I did.
There’s definitely probable cause for the newspaper search.
The only reason I can see to be upset about this search and seizure is that the local PD or prosecutor should have referred the case out to state authorities due to the nature of the documents (proving the local police chief was engaged in some kind of tax fraud involving a local restaurant; the newspaper shared it with the town council and police internal affairs), which the newspaper managed to obtain, apparently by violating the consumer fraud and abuse act, identity theft, or both. There’s no crime exception for journalists, even if they do it to uncover government corruption.