This seems to be the one Stephen refers to, though there are other possibilities:
CASHMAN JOHN [aged 20] AUG 1861 LIGHTNING B 192 001
CASHMAN WM [aged 26] AUG 1861 LIGHTNING B 192 009
Different page number, may not have been travelling together.
Assuming he is the John CASHMAN who died in 1911 in Albury aged 70, his birthyear of c1841 matches above. Though this shows a different age (from NLA Trove):
Albury Banner and Wodonga Express, Friday 17 November 1911
There died in the Albury Hospital on Thursday night John Cashman, an old resident of Tumbarumba. Deceased, who was 73 years of age, had been at the institution since March. He had been confined to his bed for a long time, suffering from sciatica.
Sadly in the same newspaper on the same day, this appears to be regarding a letter from either Reginald or Raymond (probably Reginald, based on location), regarding John's hospital costs:
ALBURY DISTRICT HOSPITAL.
The monthly meeting of. the committee was held on Monday night...
From Mr. R. Cashman, Corowa, in reply to a letter from the secretary, requesting that his father be allowed to remain in the hospital until he could communicate with his brother on the subject. He (the writer) was heavily encumbered, yet he was prepared to pay £1 per week for the maintenance of his father.
Western Mail, Thursday 26 February 1920
CASHMAN.-On February 18, 1920, at St. John of God Hospital, James William, beloved brother of Mary Cashman, of the Goldfields Club Hotel, Perth, and Eustace Cashman, of Belele Station, Murchison; aged 48 years. R.I.P.
The West Australian, Wednesday 26 March 1913
CASHMAN. - On March 23. at Kellerberrin, Maude Marie, youngest daughter of the late John and Ellen Cashman, of Tumbarumba, N.S.W., also sister of Mary, Jim, and Eustace Cashman, W.A.
The Daily News, Thursday 14 March 1946
Stockman's Lonely Death
MEEKATHARRA, Thurs.— An old stockman who once crushed 1000oz. gold from 30 tons of ore has been found dead in a station outcamp 140 miles north of Meekatharra.
He was Eustace Cashman (69).
He was well known on the Murchison and was one of the first men to find Jillawarra, west of Meekatharra. It was from one show there that he crushed the 1000 oz.
He was employed on Milgun Station, and when he was overdue in reporting back to the homestead other employees, led by Mr. R. Marsh, went to the outcamp, where they, found his body.
He had been dead for some days.
Constable Barrett, recently appointed to Meekatharra, made the long trip to bring the body to town, then took it on to Cue, 72 miles away, for an autopsy.
Meekatharra is 600 miles by rail from Perth, Cue 528 miles.