Here's the authorities they cite
> a magistrate judge ... has authority to issue a warrant to use remote access to search electronic storage media and to seize or copy electronically stored information located within or outside that district if ... the media are protected computers that have been damaged without authorization and are located in five or more districts.
> A warrant may be issued for any of the following:
(1) evidence of a crime;
(2) contraband, fruits of crime, or other items illegally possessed;
(3) property designed for use, intended for use, or used in committing a crime; or
(4) a person to be arrested or a person who is unlawfully restrained.