Many convicts were accepted by the Aborigines at different times, but the original inhabitants were choosy. Watkin Tench wrote, probably about John Caesar:
One of the convicts, a negro, had twice eloped, with an intention of establishing himself in the society of the natives, with a wish to adopt their customs and to live with them: but he was always repulsed by them; and compelled to return to us from hunger and wretchedness. 
“… one Wilson, a wild idle young man, who, his term of transportation being expired, preferred living among the natives in the vicinity of the river, to earning the wages of honest industry by working for settlers. He had formed an intermediate language between his own and theirs, with which he made shift to comprehend something of what they wished him to communicate… 
… that there was a colony of white people, which had been discovered in this country, situated to the SW of the settlement, from which it was distant between three and four hundred miles, and in which they were assured of finding all the comforts of life, without the necessity of labouring for them.