I found him in a mole mound on my backyard.
Rest of Toa Mata:
-Tahu Toa Tahu Mata but actually Metru
-Kopaka Toa Kopaka Mata but actually Metru
-Lewa Toa Lewa Mata but actually Metru
-Pohatu Toa Pohatu Mata but actually Metru
-Gali Toa Gali Mata but actually Metru