Agency_ids in the direct download GTFS for Coastal Liner, Dions Bus Service and Punchbowl Bus Company are updating on Friday 15 July.
Details about the agency_ids will be posted to the Reference Tables page https://opendata.transport.nsw.gov.au/site/en_us/reference-tables.html
Anybody who needs it desperately ‘now’, can get it from a download site valid for 1 month.