The short version of your story is: Because the new Toto products often start only in Cotton White, a lot of people at Toto and their distributors missed the change in May to the effect that they are now firing the Drake II 1G in other colors. Then, some moron decided, without asking you, to sub a standard Drake II tank in the right color for the correct tank in the right color.
You, clearly knowing how to look stuff up, pointed out to the morons that they made a mistake, and, despite an embarrassing number of people involved who "knew" the wrong answer, they are ordering the right stuff for you.
This is probably one of those cases where a direct online order would have produced a superior result than an order through a local merchant. But I'm sure it doesn't happen that often. The biggest one, which I just looked at, clearly has the components properly specified for the CST454CUFG in the right colors, although all of them are on backorder.
One other issue is the relatively-small number of units actually available in the whole US in the color you want. Less than 200 total is an infinitesimal number. So, the guy in your distributor's warehouse, who "knows" it only comes in white, is told "no it comes in bone", and he looks at his inventory, sees he has none, and assumes he is right.
All this will work out as more product flows into the stream. It's a good example of why one should always go directly to the absolutely-current spec sheet on the manufacturer's web site when a question like this comes up. Go to the sheet on some other site, and it may not be current and may not have the right info.
Good for you for standing up. (And good question, "How would you have been able to obtain a price quote on it for me, if it doesn't exist?" Very lawyerly, actually.)