Interacting with Bunker Jonesy’s conspiracy board is part of the first legendary questline you can complete in Fortnite Chapter 2 Season 7.
Unlike epic quests, legendary questlines are only available for a single week, which means you need to complete them within their deadline if you wish to enjoy their XP reward.
Finding and interacting with Bunker Jonesy’s conspiracy board next this first legendary questline ends will reward you with 30k XP, which will help you unlock some of the Battle Pass skins.