One Piece Missing was created in 2001.
The Missing Piece - book - was created in 1976.
The Missing Piece - Twins album - was created in 2005.
The Missing Piece - Gentle Giant album - was created in 1977-05.
Please clarify which One Piece theory you are reffering to.
One of Our Spies is Missing was created in 1966.
if you have a brother or sister ask them if they hid the puzzle piece.ask your mum or dad if they found the puzzle piece.look in very small places if its a small puzzle piece.
One of Our Aircraft Is Missing was created on 1942-06-27.
One of Our Pylons Is Missing was created on 1975-09-27.
One of Our Dinosaurs Is Missing was created on 1975-07-09.
One of Our Planets Is Missing was created on 1973-09-22.
One Silver Piece was created in 1976.
Nami - One Piece - was created in 1997.