Serial Port 2 was not used by most consumers and later was removed by Nintendo; it is not uncommon for newer models of the system to not have this feature.
PRODUCT DESCRIPTION
Nintendo GameCube OEM Serial Port 2 Cover Black(Nintendo GameCube)
One cleaned and restored original port cover for the Nintendo GameCube. This port cover will replace a lost or damaged for one for Serial Port 2.
PRODUCT Features
Includes:
One Balck Serial Port 2 Cover
Original piece: this is a Nintendo brand port cover, not third party