Next we pull out the ethernet and optical out ports board.

Obviously, not every component could be sourced in the USA -- nor did Google claim anything of the sort. The "Thailand" marking is direct evidence of components from overseas.

Notable markings on the ethernet and optical ports board:

The ethernet port is labeled as a PulseJack J0011D0NL (manufactured in China).

The optical out port is labeled as a Toshiba TX147APL (manufactured in Japan).