You can turn these in at Western Guard Camp - Cliff.
The dialog only seems to show up if you have at least 3 of them in your inventory.
To turn them in it uses 5 Energy.
You gain a certain amount of Contribution XP (Not a full point!)
Cliff doesn't want them for me at least. tried both Seasonal character and regular one. Checked between all the quests at the Western Guard Camp and nothing shows up. Its probably needs a hidden trigger or something. For now they are vendor fodder to me.