Key 0030

It used to open two doors in the Royal Army's headquarter in Thais, here and here. It is unknown if copies of this key still exist. Furthermore, any existing copy might not be functional anymore, since similar keys are said to have been disabled with the Summer Update 2007.

It's also not known for sure what material it was made of, however, it's assumed to be Silver since most other keys of Thais city doors were also made of this material.