Still doesn't help you, which postal employee is going to sit for 1/2 hour while you test your iphone and make sure it connects to your computer etc? They can only say, "yup it looks like an iphone", not whether or not it works.
Most things can be tested pretty easily and quickly. This would reduce fraud considerably, since you'd have to come up with an item that would pass a cursory inspection, but still fail later. Not at all easy to do.
