Hi Huey. What is an adapter for the breaker bar? Is that what I’m calling the wheel lock key?
No, just an adapter for mating my particular breaker bar (with the red handle-end in my photo) to my 17mm socket which in turn engages the wheel lock.
And yes, the lugs and the wheel lock are all 17mm (typical VAG).
Checking to see that all the accessories that should be in the vehicle are there is the job of whomever does the "dealer prep." My salesman was a bit embarrassed that many items were just left in the back when showing me my vehicle. But at least I was able to see them all before he himself packed them away. They did do a fairly good job of cleaning/waxing, although far too much wheel gloss used.
As always, the relative quality of the dealership experience varies widely by locale. My most-local salesman has been in contact with me ever since the sale. Part of that communication has been me answering his technical questions, but that's ok. Better than no communication at all.

Should they know more? - YES. But in saying that, I've been underwhelmed by the delivery experience in all but two cases in my long history of procurement, so .....🤷♂️
I've encountered sales people in the past who knew nothing about the vehicle sitting right next to their open cube office. At least look at the Monroney!!