Re: Overreach
"I read that the couple had other mobile phones which they destroyed before their rampage - surely those would have been the most likely to have produced some evidence" -- Mitoo Bobsworth
Perhaps the Farooks forgot that this was a (possibly MDMd) work phone and were careless. And perhaps they just forgot to destroy this phone. And perhaps the iPhone has contact details for the Mr Big behind it all. And perhaps they never called Mr Big so there are no phone records. So perhaps this is necessary for the FBI to get his number ...
But Mr Big probably reads the news. So he's probably destroyed his burner phone anyway.