Except of course for the laws of the state of California that expressly define the duties of someone who finds lost property. (CA CIVIL § 2080 - 2082) and the relevant part of the penal code that defines failing to make those reasonable efforts as a theft (CAL. PEN. CODE § 485). The situation is not as open to interpretation as you might think. In California the founder has no rights to the property valued at over $250 until after it is held by the police for 90 days and then an advertisement is run in a local newspaper for an additional 7 days:
Are you suggesting the finder complied with all of these relevant laws?
But consider that we don't even know that Apple has best title, or that they didn't intend to abandon title by leaking the phone. Assuming Apple had best title and right to possession, and they honestly lost the property, then you can get to the question if Gizmodo was a buyer in good faith. What if the finder said it was given to him, or he had waited 90 days, or he found it in international waters? I'm being absurd to make the point of how difficult it would ever be to prove anything in this case. ....Which is to say there is no case in my opinion.