Find the manager of the people who interviewed you, explain it was your idea and your methodology of coming up with it. How would you even know the intricate details as an outsider? Give him a color printout with some fancy graphics if you're daring. Explain that this sort of reasoning comes from institutional knowledge you possess, which is the real asset that made this sort of optimization possible.
What's the worst that can happen? He tells you to fuck off? I know this isn't the movies, but I can't help but think; not an awful lot to lose in this situation...
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