The feature is still in development, so until it's finalised I can't confirm exactly what it includes yet.
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Got it on my 10th attempt here, a little frustrating...but not too bad. And I use it every single day...
So like - If I play test and open a few of these long letter reward boxes I'll notice a change? I've just opened 4 on test following 4 long letter quests. Didn't get the recipe on test, or notice any difference.
Any chance it will take into account my umpteen failed attempts when introduced or are we all starting from 0 ?
Just got my 10th time 50 gems . . still no recipe