No one seriously believes that Gawker Media poses a continuing threat to anyone, including Apple. There's also no question about the disposition of the property; it's in Apple's hands. Further, the damage done is questionable. (I don't mean "frivolous." By "questionable," I mean that there's a legitimate dispute as to whether or not anyone suffered legally-recognized damages from the leak, as compared to, say, someone running a counterfeit-iPhone operation.)
In such a situation, most cops and DAs would put the investigation at the bottom of their pile, tell the victim to file a civil lawsuit, and then focus their resources at on-going criminal activity or crimes with substantial damages to the public.
Here, however, REACT raced into action with a particularly aggressive maneuver: a subpoena and unannounced seizure of a journalist's property. That's among the most aggressive actions they could have taken, and the decision-making behind it deserves an explanation.