I did some general searches using Autotrader and just Google.
Several dealers have pages on their sites, saying, "Come on in! Sit down and order your GTD!", like it was as simple as ordering a pizza.
Five dealers have listings with nothing other than a shell, not even a photo, stating they had a GTD inbound. Autotrader did not list the AZ dealer, but that could just be Autotrader.
I found one reference to a customer GTD arriving in North Dakota.
I think this is one of those cases where the dealer's website auto-populates it with their inventory program. I noticed this with the Bronco Raptors last year. Once something has been confirmed or set to be delivered to the dealer, their webpage automatically spits out a generated ad/inventory spot for it, whether it be a stock dealer order, or if it was ordered through them by a customer.
"This is one of the first customer deliveries (Vin# 11) finished in Gulf Heritage Blue to match the owners collection of all 3 generations of Ford GT. "