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Richard Dwyer9 out of 10 opened packs usually have more than 1/2 of the tax stamp missing. I have never seen one that had the whole thing hanging like in this scan. (Like it had no glue at all on it). Usually the tax stamp is missing on the side of the box. (Only a piece remains on the top & bottom, but not on the side). I suspect the tax stamp was "re-worked" As for the inside contents, it not that hard to find an opened pack with the contents in the condition you found.
Michael McDonald wrote an article on Cycleback website that shows how to date a cigarette pack. He specifically mentions only Series of 1909 or 1910 tax stamps were used in the years 1909-1916. http://cycleback.com/packdate.html