Thanks for clearing this up, i meant to edit this post last night but fell asleep before i got a chance, I did end up finding a letter, and can estimate based on the number of sarnaks my group killed that a 2-5% drop rate is indeed what we are at (though im sure you already spotted that
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Thanks again for an amazingly fast response!
**edit** I was getting conflicting reports on what the drop rate for this was supposed to be, some places stating common other places making it seem more rare - wasn't sure if i was just getting unlucky or if it wasnt in game.