Yes the NSW bdm is perplexing. My ancestor is
Eliza Jane Laidley Owens who was born 20 Apr
1843 at Laidley (then Laidley Plains) Queensland; her parents being Samuel Owen(s) and Sarah Williams.
However,
1843 is a long time after a marriage in 1827 and those other births in 1829 and 1831 might be more likely for a couple marreid in 1827... maybe I'm barking up the wrong tree with this samuel and Sarah??

. i have a doubt.
But i found this, which connects a Samuel Owens to my Eliza Jane Laidley Owens
THE EARLY DAYS PIONEERS AND PIONEERING ON THE DARLING DOWNS BY WILLIAM JOHN BEST GRAY
http://www.emerge.net.au/~santarem/gray/stories/stories.html...... I suppose they will not believe it when they are told that we had, in the early forties, a mail coach running from Brisbane to Gatton to the hotel kept by a Mr Walter Smith. A man by the name of
Samuel Owens, an overseer of Mr Thomas Bell's of Bellmount, near Richmond, N.S.W. brought stock of Mr Bell's from the Big River and formed a Station on
Laidley Creek and then he started the coach........A man by the name of Richard Lovell came over with Owens as a Bullock -Driver, and he was the man chosen by Owens to drive the coach. The coach after a short time out a failure, through bad roads or some other cause of which I know nothing about, and Owens left Laidley, where he had resided as overseer for Mr Bell, and he went over the little Liverpool Range and built a public house sixteen miles from Ipswich, at a place then known as the Old Man's Waterhole on the Ipswich Road.