Mr Canning confirmed that Liam had been "tapping away'' on a computer and police were attempting to track him down through the IP address of the computer used.
"As yet we have not managed to find out where he is and we cannot confirm this, obviously, until we have made contact with him.''
Police in Otago had CCTV footage of the teenager and "he looked well in that''.
Police believe he left the bus and headed south toward Dunedin, where he has family.
A CYF spokeswoman confirmed they were looking into how it was handled.
CYF put Liam on the bus to return him to his father after spending a couple of nights with a caregiver.
The spokeswoman said he was not subject to any supervisory or detention arrangements and he had agreed to return to Greymouth.
Liam's mother lives in Renwick and his father in Taylorville.