Maybe it's Lyle, who worked back in New Leaf for the Happy Home Program and just became now one of these unseen characters in NH.
Speaking of him, this kinda reminds me of that one comic:
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Coming back to the thread's topic, I would say either Orville or Wilbur taking care about the letters. I would have said Pete, but he probably stayed with Pelly and Phyllis, wherever they are now.
He worked for them as far back as City Folk actually.