Soo...a little reassurance for those of you with Window Stickers (which means the vehicle has been invoiced), I just called a dealership in California (I'm in Illinois) because I tracked the VIN of one of their vehicles that showed it was in Midlothian since 03/18 but the GMC Inventory website had actual photos of the Yukon (in this instance). The salesman was super nice and he said it's definitely there, he's already driven it. So, the Jack Cooper site was never updated...there is hope. Just because it shows Midlothian doesn't mean it's actually there. He said so many of the logistics sites are wrong right now.
Good investigating and thanks for sharing! We have hope!!!