I try to order things directly from top to bottom of the release, as that seems quite a consistent and predictable way to do it.
So same as:
'Extra' things like inserts, posters and download codes I put at the end though, not where they were in the package.
Would be great if people would use back + spine as that's totally accurate, and that kind of scan is a bit different to one where the spine has been cropped out.
I always scan the tray, because why not!