On the other hand, we do have expiry (by default) of the secrecy surrounding regular warrants when they're executed, plus the ability to challenge them at trial and in appellate proceedings, with the result that there's an enormous amount of regular case law about them, even though all of them were originally issued ex parte.

So that is very different.

The main exception that we know about in the regular criminal justice system has been cell site simulators and cell site location information, where the government tried super-hard to prevent people from knowing that this information was being collected or challenging its collection or use.