Who might have wished

1. "... You would not perchance have any notion of who might have wished my brother ill, would you?"
2. “It is not for such as me to say what might have been in your brother’s heart, Your Grace..."

Hi, dear teachers.

Do "might have been" and "might have wished" in these two sentences express the idea that it is possible that something happened in the past, as in "What's that noise? ~ It might have been a cat.", instead of the idea that something was possible but did not happen, as in "If she hadn't been so bad-tempered, I might have marry her"?

Thank you.