I guess the reason it is sealed is because they killed someone while executing the warrant. Otherwise, wouldn’t it have to be public? They sealed it after the fact. Not before. So why the need for sealing it after the fact unless they found more evidence than they have released?
AZ law allows the judge who issued the warrant to delay its entry into the public record. It's not up to the police, though I imagine they can request the judge to do it.
If a warrant is valid, sound, based on good evidence, and executed properly -- then why would it need to BE public record?
That is, isn't one of the purposes of making warrants public so that the public can be made aware of BAD warrants?