The Vanguard Quarter Master Sells them for glimmer when you have it installed. They were green unusable weapons to begin with. Even if you did pay for them they are so useless that it's not worth having it. You should have received a Suros emblem and Suros shader as well and those items will be better then those guns and can be re-acquired from the Kiosk with all the promotional emblems and shaders section.