What's the meaning of '9999', '9998' or empty in 'postcode' column in the data source of 'COVID-19 tests by date and postcode, local ...'

Hello,

May I please some advises on the meaning of ‘9999’, ‘9998’ or empty in the ‘postcode’ column in the data source of ‘COVID-19 tests by date and postcode, local …’? https://data.nsw.gov.au/data/dataset/nsw-covid-19-tests-by-location/resource/945c6204-272a-4cad-8e33-dde791f5059a

Can you please told me if the lga_name is what the lab location that perform the covid-19 test?

Thanks,

Jingyu

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