Actually make cases MobContainers when added to secure containers

[bushtail]

added section

item.Parent = "5448bf274bdc2dfc2f8b456a";
item.Properties?.IsSecured = true;
item.Properties?.CantRemoveFromSlotsDuringRaid = 
[ 
    EquipmentSlots.SecuredContainer
];

to secure container config logic.

This did not break anything when doing the changes manually in the json files, you're free to take this if you want or don't if you know it'll break things later on down the line