Hello, guys!
How i can create 'Coffin' entity?
Now i have this code, that create a large wood box:
 
private string box = "assets/prefabs/deployable/large wood storage/box.wooden.large.prefab";
BaseEntity ent = GameManager.server.CreateEntity(box, new Vector3(pos.x, pos.y - 2000, pos.z));

ok, i decided this problem. 

private string box = "assets/prefabs/misc/halloween/coffin/coffinstorage.prefab";

isnt it already in the (betterloot)  items list    "coffin.storage": "Coffin", which you can add to any loot  or item list ? it is also listed in the Rust items list

coffin.storage

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