Had a good look and the only thing I came up with was the burial of a young man in 1872.
DUNCAN CAMPBELL aged 21 years, single, a miner living at Muirhouses (parish of Cambusnethan). Parents unknown. Buried 29 Nov 1872 in public ground.
Looks as though these folk were only passing through the area. what is the date and place of marriage on the 1865 birth certificate?