Quite possibly this John died quite young and was buried at Charlbury on 16 Apr 1803.

We don't yet know for sure, but we believe it was this Thomas Knibbs who was transported to Australia in 1824. He is of about the age of the Thomas Knibbs identified below, and we know he was born in the Charlbury area. There was another Thomas of Charlbury, but he died in infancy, so clearly not him. He would have been 28 at the time the crime was committed but ages were often given incorrectly.

"KNIBBS, Thomas. 25. Committed 25th May 1824 by A.T. Rawlinson Esq. Oxford Assize 28th July 1824. Charged with feloniously stealing a copper furnace, of the value of �3, from an outhouse in Charlbury, the property of George Malins. PCOM2/349 Oxford Gaolers record, Kew: 7th August 1824. Received orders for transportation of (5 men including Thomas Knibbs) from the Secretary of State. 9th August. Removed 5 male convicts under sentence of transportation to Justitia Hulk laying off Woolwich. On Royal Charlotte to NSW 18th November 1824."
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Certificate of Freedom:
Surname Firstname Alias Vessel Year CFNo Date SRRef Film Remarks
KNIBBS Thomas Royal Charlotte 1825 31/0787 3 Aug 1831 4/4307 987

This indicates that in August 1831, he was granted his freedom.
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Stuart Knibbs in Australia has identified the following information:

Thomas Knibbs: abt 1799 - 1856. Born Oxfordshire, died Parramatta NSW AUS.
No record found of marriage or children. (Name recorded as Nibbs on deaths
index)

Convict, sentenced to 14 yrs (NSW census 1828)

Sentenced to 7 yrs (General Muster List of NSW 1823/4/5)

From "The convict Ships 1787-1868" by Charles Bateson, 1974:

"Royal Charlotte" - arrived 29 Apr 1825, with135 male convicts who landed
in Sydney (1 died on the voyage). The ship was a 471 Ton transport, master
Mr Corbyn, surgeon Geo Fairfowl. Sailed 5 Jan 1825 from Portsmouth and
travelled via Teneriffe, taking 114 days. On 8 March, the surgeon thwarted
an alleged plot by 43 convicts to murder the officers and seize the ship. He
separated the ring leaders and placed them in irons in different parts of
the ship, which ensured no further trouble during the voyage.

From Principal Superintendent Of Convicts Bound Indents (see sources):

Thomas Knibbs was convicted at Oxford on 29 Jul 1824 for a term of 7 yrs.
His native place was Oxfordshire, calling ploughman, age 26 yrs (in 1825),
height 5' 9 1/2", complexion sallow, hair brown, eyes blue.