Here is a link I found check it out apples copyrights:
http://www.apple.com/legal/trademark/guidelinesfor3rdparties.html
I think you can sell the item just state not apple brand.
I am not a lawyer...
I Don't think its illegal in the U.S. But if you are going to sell them make sure you state they are not Iphones and are not a apple brand if you don't this can get you in to some mess I would suggest...
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