Has Air Niugini ever flown to Talsea
Firstly I will assume you mean Talasea. I know they did when they operated DC3's in the early days. In 2002 they flew Dash 8's to Talasea (West New Britain) for about 6 months after Mt Pago erupted and Hoskins was closed.
The agent at Talasea in 1973 was Volupai Plantations.
http://michie.net/balus/pxroute1973.html