Finders Keepers Punch Card Fortnite is one of the new challenge sets available in Chapter 2 Season 3.
Fortnite Chapter 2 Season 3 introduced Punch Cards replacing the Battle Medal system. The way Punch Cards work is still very similar to the old Battle Medals. Players have to chip away at a multitude of objectives with the goal of earning large amounts of experience. Punch Cards vary in difficulty and the amount of time it'll take to complete individual ones.
Some require one instance while others have tiered rewards.
Finders Keepers Punch Card Fortnite: How to Complete
To finish the Finders Keepers Punch Card in Fortnite, you will need to search rare chests at certain intervals. You will not need to start over fresh with each level, so when you reach 50 chests, you'll only need to find another 50 chests, not a fresh 100. This should make this challenge a bit more bearable.
Good luck out there, and happy hunting. If you are looking to figure out the rest of the Punch Cards available in Fortnite Chapter 2 Season 3, look no further.