Check the Party Based RPG demo game to see how this can be used in a game environment. There are treasure boxes throughout the world and dungeon, and two UI buttons that will also open treasure boxes.
Each player also has an inventory, and objects can be passed from player to player by clicking on their portraits, from player to boxes, and from boxes and player to the world.
Remember, there are many, many ways to integrate this into your project. Each project is unique, and the module is intended to be flexible to fit all projects which make use of the visual inventory system.
This means that some coding is likely required to fully integrate the system.