Sorry maybe I miss read the post.
I read it as they applied for a DRW/CBA/HBA and were given one of those bases. Then they decided they no longer wanted the position.
QantasLink has Flight Crew bases in Brisbane, Cairns, Melbourne, Mildura, Perth and Sydney.
This is from the QantasLink Trainee website. I didnt realise there were bases in DRW/CBA/HBA.