User blog comment:D.Dragon123/How come???/@comment-3986064-20110909121907

Sanji mentioned that there is an index of DFs where he looked at them, Pell knows that there are 5 known powers that give you the ability to fly, he is most likely referring to DFs. Also BB knew that the DF that Thatch found was the yami yami no mi, since I believe he said somewhere that from the index there was only one DF that he wanted, you should read the chapter where Blackbear fights ace to be sure.

And Shanks said that they took the DF from a ship, they stole it