Has Ben known about the Swan Station all along?

He and Juliet are observed using the Pearl Station to spy on the Losties in the Swan Station.

However, when Ben was originally captured by Rouseau and brought back to the Swan Station by Sayid (when he was telling them his name was Henry Gale) Ben acted as though he knew nothing about the Swan Station and was trying to pump the losties for imformation about it.

So...did Ben know about Kelvin and Desmond long before the losties arrived on the island?

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charlie98210
"Whoa!" she said. "Cry 'Havoc!' And let loose the dogs of war!"
And, like Banquo's ghost, they just won't go away.