Assuming both 1. I wasn't on Government business and 2. I caught the wording ahead of time that the rate was official business only, exactly what type of "risk" do you think there is?

Hyatt is pretty clear that they will change the rate to the standard rate if you don't have travel orders. That's really the only risk. Incidentally, when I am travelling on government business, I don't get travel orders, and the paperwork I do have might not be able to be interpreted as such by the hotel. (also, since the business portion of my trips is relegated to the flights to/from destination, I was concerned they may not accept it as business travel).

Thus, it was for the best they didn't ask and an overall win.

If you're trying to imply there might be consequences as an employee... I'd love for you to explain to me how that works.

Of note: one of my supervisors recently told of how a hotel (Marriott, because duh they need to squeeze and won't be squeezed) emailed him a day or two prior to say they would be requiring orders. He was on leisure, so he simply changed the reservation.