This item is currently not available in the Guild Wars 2 API and you are seeing the last known version. The item has either been removed from the game or needs to be rediscovered.
Basic
Container
Contains Platinum Guild Challenger Trophy; Potions of PvP Reward; and Guild Challenger Decoration token, coin, and items that help restore your guild arena.
"description": "Contains Platinum Guild Challenger Trophy; Potions of PvP Reward; and Guild Challenger Decoration token, coin, and items that help restore your guild arena.",