I've been reviewing this thread. Is this a good summary of the points here?
Definitely determines authenticity
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(1) Black light test. Should not light up.
May help determine authenticity
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(1) Should be wax paper and not regular paper.
(2) Examine the color contrast between the light wax paper and the dark ink images of the graphics
(3) Look at the creases on the white border. If it is real wax paper the crease will actually break the wax and create a white line, but if it is printed on paper and made to look real the crease will just be a paper crease and not change the color of the item.
(4) There should be fold lines where the chocolate would have been inside of wrapper.
Link
Does not necessarily determine if the wrapper is real or fake
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(1) Issues with the "H" in George H. Candy Co. Inc.
(2) The number "7" on the wrapper
The difficult thing about this is that it looks like it is really difficult to determine authenticity until you have the wrapper in hand. And I don't know if you buy a wrapper off ebay and it doesn't light up under black light if that will convince ebay that item is not as described.
In this REA auction (
Link), REA states that they believed there are only around 15 genuine wrappers in the world, and that "Authentic examples such as this are actually very easy to distinguish from the fakes, but real ones are so rare that few collectors have ever even had the opportunity to compare." Unfortunately, they don't give that distinguishing characteristic.