It looks like the completed option on the main viewing page is back, at least for now. The sold option is there too, it's basically just like the completed auctions only it shows just the auctions that sold, as in none of the ones with no bids or buy-it-nows that just expired. Viewing all of the completed auctions gives a better idea of overall demand, if there's twenty completed auctions with no bids but there's one that sold then that item doesn't really have much demand. The sold option would just show the one auction that sold, you won't see any of the others that didn't.