I would've tried to profit off of it- but not by selling it. Photograph it, record it, offer to sell that, and return the phone itself to Apple.
Assuming we follow the story from Gizmodo, the guy who found the phone did get Gray Powell's name before it was bricked. So I'd just send him a message on Facebook. 'Sup, found your phone.'
Assuming we follow the story from Gizmodo, the guy who found the phone did get Gray Powell's name before it was bricked. So I'd just send him a message on Facebook. 'Sup, found your phone.'