IIRC, SL said that LB took his iPad. On the iPad under settings>privacy there is location services. If that is turned on, SL could use it to find his iPad. There is also an app called Find My iPhone to find any iPhone, iPad, iPod touch or Mac that he or LE could use to find his iPad using another iOS device. While finding the iPad does not necessarily mean that is where LB is but it may give a clue to her general location. If someone else has the iPad then perhaps they may have information where she it. I doubt it but it is a possibility.
IIRC, SL loaned LB his iPad, which SL eventually tried to have TPS examine. So SL must have got it back in order to ask TPS to examine it about a month after anyone last heard from LB.
His iPad, her SIM card, so TPS cried foul and would not examine it.