This warrant is for T-Mobile records in order to identify if anyone attempted to unlock or use the McStay Google phones after their disappearance.

SBSW-14-1593 Probable Cause Affidavit 10:20:2014

This section mentions the absence of the brand new Google phones recently purchased by the McStays:

SW 1593 google phones never recovered

This next covers the internet search performed from the McStay residence on 2/8/2010:

SW 1593 McStay Desktop used to access internet