Mystery boxes can be obtained from the Quiz Master random event. Players can choose between 1,000 coins or the mystery box upon successfully completing the event. Multiple Mystery Boxes can be owned at once, and they can be banked.
Quiz Master - OSRS Wiki
Flyer - OSRS Wiki
Walkthrough Zelda Tears of the Kingdom Wiki
Chest (Maze) - OSRS Wiki
Legendary Mystery Box! - Media - RuneWild
Treasure Trails/Guide/Puzzle boxes - OSRS Wiki
Teak Treasure Chest - Osrs Wiki Wood Png,Treasure Chest Png - free transparent png images
We'll take the box. : r/2007scape
ALWAYS pick the mystery box : r/2007scape
Puzzle box - OSRS Wiki
Magic box - OSRS Wiki
Clue box - OSRS Wiki