Your post prompted me to take another look at the whites. You almost had the answer on 233 vs. 901 when you looked at I37. There were supplements issued for I37. Supplement 2 (Feb 8, 1960) addresses the white number change. The way it states things, it sounds like the color numbering system changed but the color was the same.
By the way, the original I37 was dated 9/7/56. The last 200 was built in September and the first 230 in November. There should have been plenty of time to get a 233 white paint tank in place before 230 production began.
Here is the supplement from the McCormick Collection at WHS:
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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