^ What do you mean? Duty and (miss)understood as PV scene covers?
Well, the Duty outfit was used in the SURREAL PV, but the background aren't the same. And with (miss)understood, if you mean Bold & Delicious/Pride, I think only the hair is the same
But I am... somehow was from a PV, but I guess the PV is more made after the cover XD
And I don't think that Dearest should be the cover. Dearest was released only 16 days after the Twin Tower's fall, and I don't believe that Avex would lay money in editing the single in so short time. I don't know if the Dearest cover was released back then though.