How Do “Loot Boxes” in Games Utilize ERC-1155’s Multi-Token Capability?

A loot box is often represented by a single ERC-1155 token ID. When a player "opens" the box, the smart contract executes a batch transfer, simultaneously burning the loot box token and minting/transferring multiple different token IDs to the player ▴ which could include fungible in-game currency (ERC-20 type) and various unique non-fungible items (ERC-721 type).