These birds appear to be wild Budgies, judging from many wild-plumaged birds and the remote location of the sighting away from where you would expect an escapee to be found. There seems to be an influx of Budgies to the ACT region at the moment. This is a rare occurrence as Budgies are typically found further inland and most Budgies recorded locally are escapees. COG says that wild Budgies would likely be found only in drought times to escape harsher conditions inland. It seems interesting that the birds are here this year when there is so much rain, maybe they are dispersing widely because of the large availability of food. There are records of wild Budgies in the ACT region but it is a very rare occurrence, especially considering there are now multiple records from different locations of groups of wild birds.