can't view my sent messages?

[Ron Burgundy]

i look into my sent folder and its empty. why?

(i have sent lots of stuff)

[Radux]

You have to actually enable that option to save all your Sent messages.

You can do that in your General Settings. It's the last option in the Private Message part.
It'll start saving from the moment you turn that on. You're kind of out of luck for stuff in the past, though. Sorry.