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The Island Field Office can be found in Ginger Island North.
Until Professor Snail is rescued from the nearby cave, the office remains empty with no interactable elements. After the rescue, fossils can be donated to him and the Island Surveys on the wall can be answered in return for Golden Walnuts.
Fossil or mummy artifacts can be donated to the office so that the skeletal or bodily remains can reconstruct the forms of four different creatures. In some cases, multiple fossils of the same kind are required.