here is one from a blog, that is all in french, so i have no idea if this letter actually arrived, but there is a photo of some envelopes where the puzzle has been completed.
http://postenomade.over-blog.com/30-categorie-1184458.html
you have to scroll past some other envelopes that are somewhat stealworthy.
Not sure I am brave enough to test the postal system with a crossword puzzle just yet!
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