From what I've read so far in 1941 Australia received their 100 octane fuel directly from Shell and Vacuum Oil Company.
In fact they didn't need 100 octane fuel in 1941 as they didn't have any aircraft that required it. What they actually needed was 90 octane fuel for their Catalina flying boats.
It was possible to blend 90 octane fuel from 73 octane base fuel by slightly violating the specifications in case of emergency. However they decided to mix it locally from 100 octane and 87 octane fuel.
Ironically on 21 February 1941 (page 61) where the Australian Government is supposed to protest against the continuous supply of 87 fuel:
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It must be understood that approximately 115,000 gallons of 100 Octane Base Spirit is already in order, and delivery anticipated within the next few days.
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Page 47-53 gives stock in Feb/March 1941 and approx. consumption of 90 and 100 octane for 1941.
Page 44 gives expected amount of 100 octane for June 1941
Which were in fact delieverd, see Page 41:
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As you are aware, wer are now unloading 347,000 gallons of the 100 Octane base product, ...
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To come back to the previous theory:
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The reason why it is included amongst AWM papers is because the Australian Government at that time was protesting vigoriously about the continued supply of lower grade 87 octane fuel when it too wanted 100 octane for the RAAF.
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1. Supply of 100 octane fuel to Australia was received directly from Shell and Vacuum Oil Company without the involvement of any other Government.
2. They did in fact receive the amount of 100 octane fuel they have ordered.
3. The RAAF only "wanted" to employ 90 octane fuel where the engine required it.