Thanks Kiji, you were right about the trash can. It's the Trash Can on The Nautilus top-floor hallway, and clicking it is the only way to get the Crumpled Paper (Crumpled Letter). Muirhat only offers "The Half-written Letter" to someone carrying that paper. The trash can was placed in the world, but clicking it did nothing, so the whole line was locked behind it.

Fixed and LIVE now:
- Clicking the trash can gives you the paper, with the original line "You retrieved a Crumpled Paper standing out of the trash can...". If your Etc tab is full, it tells you so instead. It stays quiet once you already hold the paper or have finished that quest.
- The Half-written Letter -> the next two quests -> Muirhat's hunting line (Stone Golems at 55, then 58, 60, 64 and 70) all chain on from there.
- Along the way I fixed a few quests that handed back the item they were supposed to take: the letter itself, the music box, John's Pink Flower Basket, John's Last Present, and Information for Dr. Kim.

Also, Eliminate the Stone Golems asks for 80 kills. That matches the original client data, so it isn't a bug. Please refresh and give the trash can another click. I'll close this once it works for you.

Moving this to Fixed. The Trash Can in The Nautilus top-floor hallway now gives you the Crumpled Paper, and Muirhat's whole line (The Half-written Letter through the Stone Golem hunts) follows on from there. If the paper doesn't appear for you after a refresh, reply here and we'll reopen this straight away.