Thanks Rod - I share the romantic notions. For the first cover, a quick search at trove proves we're right:
https://trove.nla.gov.au/newspaper/...l-decade=186The first cover is a nice example of the use of the 6d DLR for the intracolonial postage of 2d plus the 4d registration. Parkes is gold country. The address also tells us that Chinatown was originally at the north end of George Street!
The second cover is addressed to Marysville in California and the front bears another two 2d DLRs. Posted from Narrandera, the postage on this cover is overpaid by 2d (should've been 10d: 6d postage to USA plus 4d registration).
I love my stamps, but I love my covers more

PS:

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