First off, that is the most meticulous sod installation I have ever seen!! You are light-years away from what most new install start off with, so rest easy.
Secondly, and it's more a question than answer, but is it normal practice to box in your lawns with that raised-bed edging you have for your plantings? It leaves me wondering where your water runoff path will be, unless your soil is such that it percolates easily. Where I'm at with the clay soil of the SE US that's how we build swimming holes! lol Our ground does not percolate anywhere near as fast and we need to direct the water overland. Hopefully your situation is more a matter of needing a few days to dry out.

 

You should be completely fine. Stay off of it, watch it for drying out or getting grey looking at the edges and let it take root. Give it another week before you attempt to mow.

 

There is a slight slope around 3-4 degrees on the turf area and down at the lower end near the retaining wall there is aggregate pipe below for drainage. Before the soil went down the water dis drain fine.

 

Looks great! I imagine the brown corners are from the top of the sod roll where it was in the sun during/before installation. Considering it's mid fall where you are, i would not scalp it or anything until next spring and then do a sand level.

Keep an eye on the soil moisture. If the sub soil doesn't drain, then the top solid layer may hold a bunch of water. Not saying you'll have issues, just keep in mind that the top soil absorbs water better so it may stay wet longer.

Is it me or does the tiftuf just look better in Aus!?

 

Thanks for the input and helpful information guys.
I will be sure to give you another update in a week after the turf has been down for 2 full weeks