Does the contact/3rd party who received the messages have an iPhone as well??
If yes & if he received the messages via the persons Facebook, there is a way of identifying whether the mobile phone was used to send the Facebook messages, or whether it was done via a web browser. This might help show whether he lied (mobile phone was used) or whether he was hacked online (web browser was used).
If you are interested, here's the simplified version of the steps to take.
(Assuming you have taken a data extraction of the receiving handset)
1. Navigate to the following location:
mobile/Applications/com.facebook.Facebook/Library/cache/4110.0/Three20
2. Within the 'Three20' folder you'll find many XML files containing loads of strings of Facebook data including artefacts like fb ID, to chat ID and so on... Locate & open the relevant XML file with the notable messaging data.
3. Locate <tags>source</tags> XML entry. (Records how message was sent). This will either be:<tags>source:mobile</tags> - Mobile app<tags>source:chat</tags> - Web browser - Live Chat window<tags>source:web</tags> - Web browser - Messages View
...if he does not have an iPhone, then you did not need to read the above!
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