Here, you will see a search bar prompting you to enter the designated UEFN map code for the Rapid Realistics 2v2 map: 3237-7822-8160. Once you've entered the assigned map code, you can hit confirm.

UEFN map code Since the Box PvP map is one of the more popular box fight maps in Fortnite, along with a dedicated player base, it should be relatively easy to spot in the Discover menu in-game.