Guild Wars 2

Hello, I just today got a chest with PvP rewards. Within it was four peices of Outrider armor. They were unusable by my character, I imagine they’re basically armor skins. However, I deposited them as collectibles (there was an option for this) and they’ve completely disappeared. Looking through my collectibles, they are nowhere to be found. Any help?

You can find them in the lockers in the mists where you do pvp.