I'm hearing this type of a story, fiction for the first time. Having revealed so many things you should have revealed the rest of the things also. This is as if last chapter missing in a griping novel. What should I name it, absent minded, carelessness or quoted less as you were not confident about your chances bagging the offer or what, how to name it? As you said it would be stupid to give this kind of reasons for your claim for upward revision of your CTC. May be, you'll try your luck for extracting better terms if you threaten them putting down your papers. By chance if they won't budge? Yes I'm sure you are going to try this as well having dared not to do unimaginable things so far.
18th December 2018 From India, Bangalore