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AFIAK all Campaign traits presented in the "[AP XX] player's guide" web enhancement aren't allowed in PFS.
To cite the Carrion Crown player's guide:
Campaign traits are tailored to a specific Adventure Path and give your character a built-in reason to begin the first adventure in a new campaign. Campaign traits assume a lot more about your character’s backstory than do normal traits, and they are meant to help serve as inspiration for a player working to create a detailed and interesting history for her character.
That kind of traits are generally stronger than normal traits but they are made that way to encourage people in picking them for that AP, not for general use.
For the other traits you must see the list of allowed material for PFS.
You can find a list of that here.
For the Dragon Empire primer it list:
Pathfinder Player Companion: Dragon Empires PrimerArchetypes: all archetypes on pages 22-23; Feats: kitsune feats on page 5 are legal for kitsune characters; all feats on pages 24-25; Gods: All gods listed on pages 26-27; Other: Oni Bloodline, Void elemental school; Races: To create a kitsune, nagaji, or wayang character, you must have a Chronicle sheet that opens the race as a legal option at character creation. Spells: Call the Void; Subdomains: Moon; Traits: all traits on pages 8-21, except Chosen Child and Rebel Leader
So I think that you can take the Swamp Rebel trait for a PFS character.