For every day you log into the game during pre-order weekends as well as Open Beta, you will receive at launch different rewards for testing in a form of a Boom Box. These boxes contain a random assortment of possible goodies, including XP buffs, unique runes, weapons, housing items, unique costumes, mounts, and more!
During the last pre-order beta weekend, there were some server stability issues, and Carbine team decided to reward everyone who logs in throughout the weekend with DOUBLE boom boxes!
Boom Boxes rewards
In the gallery below you can see some of the unique items which can only be gained through the Boom Boxes