https://www.ato.gov.au/law/view/document?docid=TXR/TR964/NAT/ATO/...

https://www.ato.gov.au/law/view/document?docid=TXR/TR964/NAT/ATO/00001

13. Where shares cannot be identified by reference to either individual numbers or share certificates, but a taxpayer maintains appropriate accounting records, as outlined in this Ruling, of the acquisition and disposal of shares, that will be regarded as sufficient to specifically identify shares to determine their value for taxation purposes. A taxpayer then is able to identify which shares are being appropriated to a particular sale transaction.

mce-anchor14. For that purpose, it will be necessary for a taxpayer to maintain contemporaneous records that will account for the purchase and sale of shares on a trade by trade basis. Those records will be regarded as sufficient for the purpose of specifically identifying shares if they:

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allocate a specific identity code to, or otherwise identify specifically, each buy or sell transaction;
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identify the company in which a parcel of shares is acquired;
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identify the class of shares acquired;
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identify the date on which shares are bought or sold;
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record the price at which parcels of shares are purchased and sold;
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record the balance of shares acquired in a particular trade where a proportion of those shares are appropriated to a subsequent sale transaction; and
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preserve the integrity of those codes and system through inbuilt system or other audit trails.