I ordered two Wii U Pro controllers from Amazon from a seller by the name of "Gamer Force". I had problems with both and was about to send the second one back when I decided to purchase another from Wal-mart first. Here is a side-by-side comparison of the two controllers and their boxes:
This is a side-by-side of the two. The real is on the left, fake on the right. Ad you can see, the nintendo logo on the counterfeit one is a bit grotesque.
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Here is another. Real on right side. As you can see, the real one is much glossier, and the d-pad is smaller, and the lines on it are whiter.
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Real seal
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Fake seal
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Real box on left.
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Real controller
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Fake
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Just thought I'd gice you guys a heads up. I didn't know that counterfeits of these controllers existed. Note that the two controllers do have the same model number.
The main problems with the counterfeits were, well their counterfeit for one, and the analog sticks on both controllers had problems.