So I'm walking to class through my university's library parking lot, and I spot a brand new Iphone 6s sticking up from behind the wheel of a car. My guess is this person broke up with their lover and said lover tried to destroy the iPhone, but I saved the thing. So of course I'm posting on my uni's facebook lost and found page and asking around trying to find the rightful owner, because I'm not a douche.
But my question is, how long am I morally obligated to hold onto this thing before I sell it?