Prevent Looting provides protection for entity of player (boxes, furnaces, careers, etc.) from looting by other players. Ideal for PVE servers, but can be used for PVP. The plugin supports in-game teams, FriendsAPI, ZoneManager and permissions.
You can configure the plugin to work only in the range of the cupboard or not. And all who will be authorized in the cupboard will have the opportunity to loot.
Attention:* When anyone try to loot sleeper, his inventory will open, but...