I agree with Stephen. I reckon that it's an Eastern Three-toed Earless Skink.
Hemiergis talbingoensis davisi to be precise, based on the locality.
The main reason being that the flanks are grey-brown in this specimen, whereas in Saiphos equalis the sides of the face, neck, body and tail are dark brown to black, which contrasts sharply with the paler dorsal surface. If anything, the flanks are paler than the dorsal colouration on this animal.