He certainly would have done it; there is a way to "beat him" anyway: ask him to send the photos he took also to your email. Photos are usually dated (even the PC and, in any case, the phone are not very reliable from this point of view for me because one can modify the time and date however they want), but there is one detail: if he sends you a message, it is dated, so all you have to do is have him send it at the same time he takes the photo, or shortly after—the problem is that he has already done it. However, if someone does not deposit with SIAE and instead deposits via Creative Commons, I think they have an "electronic" register, so even the time could be valid, not just the day.
Anyway, I would have made that iPhone take a flight of a few meters, but how did he allow himself to do that?
Exactly what I'm saying, Riccardo, you have to prove it later, because SIAE does nothing more than "make available" (what an effort, eh) what you have and what they have deposited; then, if you have (and here doubts arise: how do they know exactly when you wrote a piece if perhaps you create it with software and the PC has a low battery, marking the year 2000 but in reality you wrote it later, or perhaps before, and above all, it cannot be a very valid proof because as stated, one can modify the time and date; even if someone had them on DVD, how do they prove it? We are back at the same point), for me one way would be this—it's a provocation obviously, but only to a certain extent: a person, no matter how far behind they may be with their studies, has their own way of making music, whether it is banal or complex. Two people compared using the same music creation software, for example, or two themes to develop, would in my opinion exhaustively express their way of interpreting certain things, so you would see immediately if a piece could have come from one person's head or another's; that being said, if someone knows how to put themselves in another's shoes by "imitating" them, they could still counterfeit, but I wouldn't bet on it.
I have heard absurd things at SIAE, people who showed up with dance music CDs, and all it took was saying "no, it is not transcribable," and they would let them deposit it without a score; we are talking about madness, always for convenience obviously. Then, if their PC crashes, the software fails, or the CD gets demagnetized, what will they say then? It's better to write and at least know how to write sufficiently well. (This is another topic, obviously).