I understand the difference in probability between regions having looked a prior data when I applied for DV-2019 and would never intentionally choose the wrong region to increase my chances, that would just be silly on my part. This isn't a simple span of the mouse wheel (the two countries and cities sit pretty distant alphabetically); plus I check such information carefully and slowly before submitting (every time) so genuinely don't believe a mistake was made. This is the entire basis of my question - I expected an AS case number (if selected) because I've always entered the same details every year I've applied for DV. The only difference in [additional] information entered this year being the OC passport for DV-2021.
The alternative is to let the selection letter / potential opportunity go to waste? What should I do? The only person who will have, and can verify, my eDV submission information will be the CO (KCC does not release application information to anyone including applicants). I understand the consequences here but surely this can be explained in future, if it gets to that? But just to be clear, you're referring to my ability to apply for/obtain a visa to the U.S. in future? What about for short-term travel < 90 days, could I have problems with future visa-waiver applications also?
Nevertheless, I will definitely keep more detailed records of any future applications should processing of this one go south.