Guys face is shadowed. I could make a claim it was me, ha. For the claim to be valid the guy needs to say" I was surfing (x) beach (not a popular spot) on (x) day and my (x) gave me the camera for my bday." Another hint....The gopro was under the sea for over 6 months, but in perfect condition except for some moss and a barnacle on the housing. Says a lot for the cameras durability.
Over 6months??? dude, the owner has most likely moved on... Its probably safe to say it is now yours. lol.