Ben and Christian

Ok, so I'm rewatching s5e12 Dead is Dead and it made me think.

During the scene in Ben's old house with Frank, Sun and Ben, when Frank mentions that the guy who told them wait for John Locke was called Christian, Ben snaps around almost as if he knows who Christian is.

So, my question is, and I may have missed this somewhere but don't think I have, does Ben know Christian, or at least know of him being on the island?

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