Depending on what you are looking for, here are the most likely ways to "prepare" or obtain these items: 1. Fortnite: Building a Piece Control Map
If you are preparing a physical or digital map for a project: How To Make Piece Control Map | Fortnite Creative Depending on what you are looking for, here
: Map Pieces are rare drops (not guaranteed) from specific World Bosses in Sea 1. Where to Farm : Map Piece 1 : Excalibur (Knight) or Cursed Vessel. Map Piece 3 : Qin Shi or Solo Hunter. Map Piece 5 : Manipulator or Slime (Demon Lord). Depending on what you are looking for, here