The lootbox can only be seen in Metamask mobile app at the moment.
Metamask Mobile App:
Switch to the 'NFTs' tab on the home screen and make sure you are on the Step Network,
Click on the 'Import NFTs' button,
Enter the contract address of a lootbox into the 'Address' field:
0x4A5927f391711851f3C72e979b21f6CfA8554AFfEnter ID as the lootbox ID, which consists of 5-6 digits and can be found in your claiming transaction's hash,
Click on the 'Import' button.
Metamask Web/Extension:
Scroll down your 'Assets' tab,
Click on the 'Import tokens',
Enter the contract address of a lootbox into the 'Address' field:
0x4A5927f391711851f3C72e979b21f6CfA8554AFfEnter ID as the lootbox ID, which consists of 5-6 digits and can be found in your claiming transaction's hash,
Enter a random name in the 'Token symbol' field,
Leave 'Token Decimal' as '0',
Click on the 'Add custom token' button.