In the stamp category "Oceania", there are multiple subcategories for Australia and New Zealand, but nothing for the other countries. I just put a French Polynesia stamp under "Stamps/Other" because I couldn't find anything better. There are or have been many stamp issuing countries in this geographical region that aren't covered by the current categories and probably not large enough to each require their own subcategory, so this would take care of the issue.
Please add the category Stamps/Oceania/Other