면 모르다

you wont know unless you try

Three jobs in these lines. Straight, it is the negative twin of 면 알다: 안 써보면 몰라 'you won't know unless you try it.' As a snapped question it means the opposite — 네 오빠 검찰에 넘긴 거 보면 몰라? is 'can't you tell just by looking?' And 면 몰라도 concedes a narrow case before refusing the big one: 일부면 몰라도 구체적 자료 없이 전체 복원은 불가능합니다 'a part of it maybe, but not the whole thing.'