I saw a sentence written like that. "We're not proud of those choices although they may have seemed justified at the moment." Does "...have seemed justified..." have the same meaning as "...have been justified..."?
She is pretty. / She seems pretty. She was pretty. / She seemed pretty. She may be pretty. / She may seem pretty. She may have been pretty. / She may have seemed pretty. She must be pretty. / She must seem pretty. She must have been pretty. / She must have seemed pretty.