Coordinates/Vector of Item & ItemContainer

How to get the coordinates/vector of an Item or ItemContainer?
With a BasePlayer, you can use .transform.position and get a Vector3

 

Item containers may have a entity source or a player source, it should be obtainable by ItemContainer.entitySource if I remember right. From there you can get the transform of the entity.

As for Items, they don't have a transform unless they're dropped, in which they're turned into a DroppedItem, instead of Item.