Fortnite Chapter 6, Season 2's Story Quests are back after a brief hiatus for the Outlaw Keycard Community Quest, but Stage 4 presents a significant challenge. This guide explains how to equip the Sensor Backpack and scan Mysterious Energy Signatures.
Stage 3 of the Wanted: Midas Quests requires opening an Outlaw Chest, demanding you reach Rare rarity with the Outlaw Keycard. This involves extensive vault robbing, guard eliminations, and gold spending, potentially taking several hours. Upon completing Stage 3, the challenging Stage 4 awaits.
The "Sensor Backpack" isn't found in chests or on the ground. It's located behind the wolf statue south of Crime City, near the Secret Wolf Pack rendezvous point. Interact with the case on the ground to equip the backpack.

With the Sensor Backpack equipped, locate three Mysterious Energy Signatures near the backpack's location. Head up the mountain; three areas marked with exclamation points indicate their positions. Interact with the glowing lights at each location.
While relatively close together, interacting with all three is necessary to complete the quest and earn XP. Prepare for potential encounters with other players also completing Outlaw Quests. Consider looting beforehand for better combat readiness.
After completing the Sensor Backpack challenge, proceed to Stage 5: stealing the Mask-Making Book from the Mask Maker's Hideout. Efficient players might complete this in the same session, especially with vehicle access.
This guide covers equipping the Sensor Backpack and scanning Mysterious Energy Signatures in Fortnite Chapter 6.
Fortnite is available on various platforms, including Meta Quest 2 and 3.