One of the items obtained via the 1st year anniversary [Event] Field Boss Reward Bundle. Currently the only way to get it in-game.

Лично мне,(месяца три назад) удалось украсть у торговца инструментами в Арехазе Ами.Но у него не очень удобно назад дружбу набивать. Долго пробовала у смотрителя пристани, все таки стащила и у него ракушку. Решила попытать удачу и старосты Дурибан, с 10 попытка вытащила))ракушку.

I wonder what the chance rate is; I've gotten about a dozen Giant Fish Bone Wall Ornament, several Plate of Chopped Meat, and just about every other random item you can get but this ornament. At least many people with CM orders for the other two decorations will have a pleasant surprise.

Edit: I know someone got this in 2024 but I really question if it can still be obtained. I used all 12 of my characters, each had 591 energy so roughly 49 tries each. All of Arehaza hates me, I've gotten multiples of everything except this.