Odds are they'll find nothing of interest on this phone. It was an employer-issued phone -- not the kind of phone that trained operatives are going to use to contact other operatives.
They use "burn phones" for that kind of work. And the couple was seen the previous Sunday, throwing "stuff" into a lake (probably disassembled lap top and, maybe, phones).
>>>an employer-issued phone...
with encryption? Dang, those office meetings need to be top secret!
When they finally crack it, it will probably say something like DON’T FORGET TO DRINK YOUR OVALTINE!