Players who like to run dungeons, lairs, and scenarios for loot in Secret World Legends can do so with reckless abandon this weekend — and it won’t cost them a single key. From Thursday, January 25th through Sunday, January 28th, all of the boss loot chests in these instances (and areas for lairs) will be completely free to open. It won’t matter if you open 10 or 110 or more. Now is definitely the time to farm for and hoard that loot! After Sunday, however, regular key mechanics return with each chest requiring a key that is either grated daily as patron benefits or bought with Marks of Favour. Note: The free key weekend does not include the various loot caches dropped by killing mobs throughout the game.
Source: SWL Twitter