Be persistent. The photos were required for Honda Central (wherever that is) to make the decision on. From those THEY accept that a warranty claim is valid, so it's not a local decision and they won't loose out.
I think he's just playing hardball/trying to fob you off.
Don't be deterred but keep it friendly and try again.
If you need to see the close-ups I took of our corroded wheels for comparison, drop me an email.
The fronts were quite unsightly, with flaking paint and pitted alloy around the centre caps and when I washed them more paint came off, so it was clearly spreading under what looked like good paint.
Take a look towards the back of the spokes too, right on the back sharp edges. The paint on ours was beginning to split away from there too.
I make them sound REALLY bad. They weren't - but something I'd expect on a neglected 10 year old car, not a low mileage 3 year old with one owner. All the indications were that the corrosion would only get worse - especially with winter coming up, salted roads and freezing temperatures.
If the claim had been turned down I'd have had them refurbished myself, or bought aftermarket wheels - both about the same at £260 - but if you don't ask......
Good luck.