Corrie's family can give his laptop/tablet to the police for inspection - of course. But they can't access Corrie's Facebook, let alone give permission to the police to do so.
Facebook clearly states that they MAY share information of someone's Facebook, but only in response to a court order or subpoenas. I've quoted part of Facebooks terms here:
"We may access, preserve and share your information in response to a legal request (like a search warrant, court order or subpoena) if we have a good faith belief that the law requires us to do so. This may include responding to legal requests from jurisdictions outside of the United States"
I find it strange that as Corrie is listed a 'missing person' and has been missing just 8 weeks, the police have already gone through a court process to gain access to his account. As a missing person I'm not convinced they'd be granted a warrant so soon....or indeed that the police would even request one. And nothing has been made public about that, so I bet they haven't.
If someone is logging into his account, I just can't see it being the police. What's more, the police don't need to regularly log onto an account for the data - they would download it all in one go.
IF they had access to it they may log in to check his private inbox messages, but who would be sending him messages when he's disappeared?
She stated very early on that his social media accounts had been accessed by the police. Twitter, Facebook, instagram, and plenty of fish and not to worry about it appearing he's active because it was infact them and or the police checking on things.
BUT then went on to say they did not have access to things like WhatsApp.
WhatsApp backs up to Google drive (on Android phones) which is retrievable remotely (I hear court order in the back of my mind needed).
Which for me brings back into play this entire dual sim aspect of his phone.
We all know that a PAYG sim is near impossible to trace,
His phone creates two separate IMEI numbers when a second sim is inserted, and it switches between the two, they do not communicate - they can be two separate net works, types, anything.
The idea he Has or had a separate sim is only their account of knowing him (no disrespect) and therefore to me remains a point that maybe he still has his phone, factory reset, new sim inserted and the phone is as good as new.