Using a spreadsheet is a useful way for you to keep track of the documents you have for BDM events for the people you are researching.
A spreadsheet is of no use for the collaborative, pooled efforts of a forum. The substance and presentation of the individual documents is of use to a forum.
If I am asking you about a particular birth record I do not mean....eg...... the contents of A12 to A20 on your spreadsheet.
I am asking you to look at a particular document.....give thoughtful consideration to what you are seeing.......and pass on that information for a forum to work with.
Your enquiry has generated more than 65 posts, and we seem to be barely treading water.....not much progress. There might be someone out there who does know about your BRADBURY and / or WILSHER families, but working through so many posts would overwhelm even the most interested person.
You do not need to hurry with your research here, but you do need to be making some progress.
Start with the marriage certificate. This is the earliest evidence you have that Sarah and Harry ever existed. Is this a typed (transcribed) document, or an image of a handwritten document?
What date is on the marriage document.
Do you see a signature for Harry and Sarah....or do they use their mark?
Are the signatures well formed...suggesting a level of education. It does not have to fit a level of education but can be useful to note.
Witnesses Thomas Grey VENNER and Marie Ellen CASS.......each followed by a question mark. Is the question mark on the document, or is it your uncertainty about the names?
You need to account for these witnesses. If Harry and Sarah marry soon after arrival you might expect the witnesses to have travelled on the ship with them.
On the passenger list for "St James" I see Thomas GRAY, 38 years....Thomas VENNER 17 years.
I am not seeing Marie Ellen CASS on the passenger list. If Marie Ellen is not on the passenger list you might wonder who she is......in Maryborough when the "St James" arrives.
BDM QLD marriage
1874 C455 Sarah Anne WILSHER marr. Harry Arthur BRADBERRY (28 Jul 1874)
Maryborough Chronicle, Wide Bay and Burnett Advertiser Saturday 25 Jul 1874
https://trove.nla.gov.au/newspaper/article/148068253?...arrival of the "St James" on Thursday.........
that would be....... arrival Thursday 23 Jul 1874....married 28 Jul 1874...five days later. Where do you see them marrying one day after arrival?