The Argus (Melbourne) of 2 July 1872 reported that: "The R.M.S. Bangalore beat the South Australian branch steamer this month by nearly two days. The former arrived at Queenscliff at about 4 a.m. on Friday (28 June), while the Rangatira was not sighted at Glenelg until late on Saturday night".
The first of a four page regular publication related to shipping and markets, etc is included below. It was produced for the P&O steamer Bangalore when it delivered its mails. A companion newsletter (not included here) was headed ADELAIDE COMMMERCIAL REPORT - Per 'RANGATIRA' to King George's Sound, thence per 'BANGALORE'. It is dated Adelaide, South Australia, 16 July 1872.
The whole document is fascinating but the second paragraph in the extract below relates directly to the beginning of the use of the Overland Telegraph Line. As it notes, the line was then in use even though there was an incomplete section of about 100 miles in the centre.