And the case likely was "we swear it is very important for national security, trust us!" and that was enough. Search request is almost never refused, e.g. FISA

And the case likely was "we swear it is very important for national security, trust us!" and that was enough. Search request is almost never refused, e.g. FISA court approves over 99% of them. And if the court already deemed the proof strong enough to do the search, surely it's strong enough to put a non-disclosure on it if asked.