This is probably the most interesting hunt I've found today. Maybe those letters will be collectible items someday.
As long as none of the mysteries are written by Steven Moffat I guess this is a product with quality. :-)
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Thanks @holovision! Glad you liked it. I believe this is a unique way to let people play - with something 'real' and tangible to wait for - nice contrast with all the stuff we can do virtually already :-)