No need to attach any part of the document Eric. I am not doubting you at all. What I am suggesting is that Rev Paton completed the civil registration section and sent that off to NSW BDM.
Civil registration for marriage commenced 1856 in NSW. So from then, whenever a couple are married in a church, there is actually TWO ceremonies, usually running concurrently. There is the Church service and there is the Civil component. So when the couple are led off to sign the register, and the witnesses go along with them, the two ceremonies become quite significant. The church register is signed (sometimes several times, ie at least twice if a C of E service) and then the civil register is signed. In some countries these two ceremonies are held on different days. In NSW they have been held together since the introduction by the NSW Parliament of the civil component.
So it is unlikely that both the church register and the civil register are lost. It is of course possible that the clergy transposed the information onto the forms for the NSW BDM, rather than have the couple sign these at the same time as the parish register and the civil register.
Very complicated administrative procedure of course
NSW government adminstrative procedures are often so even today
My CD for 1913 is NOT working ..... I will try other ways
Cheers, JM