If Apple is claiming trade secret protection, they need to demonstrate that they attempted to protect the secret. Apple authorized taking the phone into the public. These "secrets" were not taken from the Apple campus or workplace.
I believe that if I have a briefcase full of confidential documents, it would be logical that I can leave my workplace with them without them suddenly not being trade-secrets anymore. I can bring them to the airport. I can put it on a chair next to me while I eat and if I forget them, they are not suddenly considered open.
To me, the point of this law is that the finder's-keepers attitude is encouraging theft. I think "I found it" is a common alibi for theft. If you get rid of that alibi (which doesn't harm people who would return the items) then you discourage actual theft by making it harder to buy and sell.
The only people who are inconvenienced are those who truly did find an item and keep it. There's an exemption for items of small value so as not to burden those people too much. That's just my view of it.
Gizmodo never disputed that the phone was Apple's property and they returned it to Apple as soon as Apple claimed it. If Gizmodo physically damaged the phone they should be responsible for the damage caused to the device.
I actually don't see a huge problem if I lose my phone, someone else pays $5000 to the finder and then turns around and returns it to me when I demonstrate that it is mine.
Taking photos of the device isn't the issue. Anyone could easily have taken a photo of the phone at the bar. If you are saying the visual appearance of the product is a trade secret then it should not be paraded about in public by employees.