“All existing players have been sent mail with enough Essence of Luck to increase their account magic find to 20%.”
Why have I not received mail with this?
I had this same issue at first, then I realized that both Moto’s coins and the luck boosters get put into the personal mail bag of the first character you logged into after the patch; not your account-wide mailbag. I hopped on my thief for a moment and then switched to another character, then started wondering where my stuff was. I popped back in the thief and they were both there.