Can I use wooden tea boxes to ship in ? Plastic cases ?

No, there are severe quarantine restrictions on international shipping using wood. Unless it is fumigated, or heat treated and has an official ISPM 15 verification stamp ~ it cannot be used.

Plastic cases can be used. On the condition they are sealed, strapped closed and have a shipping mark. It is common to tape a square of cardboard to plastic cases, and then to write the shipping mark on the cardboard.