If you have a hunt around Photrio (welcome, by the way!

) you'll see a lot about old papers - I'm particularly mouthy on the topic because I've had good luck with them, especially with the vintage you have there. Storage conditions are a key factor and, as you know, in Australia that can range from Tassie highlands snow, to 100% humidity 45°c Broome. That your paper is not of the early multigrade variety and before the cadmium was stopped bodes well for its viability.... Unless it's been living in a tin shed out the back of Four Mile.
I buy these local to me (Victoria, Australia) and pay $2 or $3 a box. I use them in pinhole cameras and for doing paper negative reversals. I'm guessing the W.A. in your username alludes to Western Australia? I'll be at the Perth airport for about forty whole minutes in a few months if you wanted to save the hassle of posting!

In seriousness, I am interested, but I suspect the postage cost would outweigh the paper's worth.