are they not written in the book of the events of Solomon?

This can be expressed in active form and assumes that the answer is positive. The question is rhetorical and is used for emphasis. Alternate translation: "you can find them in the book of the events of Solomon." (See: rc://en/ta/man/translate/figs-activepassive and rc://en/ta/man/translate/figs-rquestion)

the book of the events of Solomon

This book no longer exists.