https://www.gamespot.com/articles/fortnite-how-to-complete-search-for-a-chest-with-d/1100-6461387/

We're approaching the end of Season 5 in Fortnite, but before this season wraps up, players still have a few more weeks of challenges to complete. Week 7's tasks are now available for all platforms--PS4, Xbox One, PC, Switch, and mobile--and feature the typical assortment of free and Battle Pass-exclusive challenges, but one of this week's objectives is a little different from the usual fare.

Among the new Battle Pass challenges is one that has players searching treasure chests. This sounds straightforward enough, but this particular task works a little differently than previous challenges of this nature. Rather than being able to open any chests around the island, this challenge is broken up into multiple steps that have you traveling to a specific area of the map and opening a chest there. Each of these steps rewards you with one Battle Star, so you'll receive a total of five if all of the steps have been completed.