Am I the only one that remembers the line where the noble said that it was a duplicate?
She can easily later go, do the boss' sibling another favour, explain the situation and ask to read the tome.
Maybe it was in one of the books that the MC read a before the test? Also, when was the research published? A few weeks ago? Months? Years?
Way too much information left unknown.
Must be a japanese thing; they must look at us using the word "combo" in the same way, kinda like asking "why are they using the word for fighting games for a meal set?".