Could somebody please offer advice with the following

I have received pricing for a 20 segment DONE4 ex NRT.

My problem is that the agent will not courier tickets to my Australian address.

I have received advice from QF that I may be denied boarding at SYD or be refused entry in NRT on my arrival there by immigration.

I am travelling on a One Way ticket SYD-NRT and I need to prove that I will be departing Japan and I have been told a receipt for the paper ticket or a letter from the agent may not be enough proof.

Has anyone had experience with a similar scenario or does anyone know of an agent in Japan that will courier the tickets to a Australia.

Thanks in advance