A detail I missed in the initial news reports. This was filed by the Associated Press on February 16th:

The couple took pains to physically destroy two personally owned cell phones, crushing them beyond the FBI’s ability to recover information from them. They also removed a hard drive from their computer; it has not been found despite investigators diving for days for potential electronic evidence in a nearby lake.

Leads me to wonder how much information, if any, the FBI might find on Syed Farook’s work iPhone.