Password Piece is located in files that are named password_piece.txt, which is located randomly throughout the Terminal Folder. There are more than 20 possible locations of where password_piece.txt could be. It is random to all players.
Password Piece gives you knowledge of what your full password may be. Upon obtaining 6 Password Pieces, you will know what your full password is. By typing the command “/terminal command:adminunlock [password]”, you will be a Terminal Admin. This is required to unlock Garden.