Originally Posted by
sciencephile
When these are created, every item that is dropped from gear and treasure are placed in items so a GM can get to them outside of the parcels without having to own the original book that the item came from (Core Rulebook, Advanced Player's Guide, etc.). The "Campaign-Specific" items are items that are presented in the module in the Adventurer's Toolbox (or in this case, an appendix). Every one of those items you mentioned were presented in the Kingmaker Adventure Path as new items. I'm not sure what source you are looking at but according to Archives of Nethys, they are only found in Kingmaker. So I guess it is the definition of "Campaign-Specific" that is confusing. It is not that you cannot use the items in other campaigns, but where the items were introduced.