The Missing Post Office was created by Kubota as an installation for the Setouchi International Art Festival in 2013.

[4] The concept of the Post Office Box is based on the idea that it cannot be stocked and held in place because the address is unknown.

Addressees include deceased individuals, future descendants, first loves to whom the writers were never able to express their feelings, themselves, and long-time favorite items.

Visiting the island to seek inspiration before the Setouchi International Art Festival, Kubota saw her reflection in the window of the former post office, felt that she had "washed up here", and decided to create the Missing Post Office as "a place where people could experience the same sensation that I did.

"[3] The Missing Post Office opened as part of the Setouchi International Art Festival on October 5, 2013.

[2] On August 24, 2014, a "Missing Post Office in Takamatsu Airport" was installed, extending the project off the island.

[10][15] The Missing Post Office appears at the end of the third episode of the January 24 broadcast of the 2022 Fuji TV drama series Don't Call it Mystery.