@NorthernLoop
In the first picture where are the small disk retaining screws? Or don’t fiat use them, or are they sheered off in the hub?
I am wondering if these were left off and the disk wasn’t fully seated when the wheel was refitted.
If it wasn’t flush and caught on the protruding lip of the hub then on the move that could have then seated properly and the wheel would be loose.
Now that you’ve perhaps prematurely involved your insurer you inevitably will have a marker that you’ve cost them money in processing a claim and you will have to tick the box in future years so your
insurance may significantly increase even if they don’t pay out therefore you could now ask them to send a loss adjuster to go and inspect the hub and wheel.
Witness marks on the back of the disk might be a clue.