Something About Boats

Maybe I'm missing something here, but as far as I know there are only 3 boats on TV's "Lost." The fist boat we saw was the fishing boat used in the last episode of season 1 when "the others" stop Jack and his crew from escaping. The second boat is Desmond's sailboat, while the third is the smaller boat we saw Sawyer and Kate use in the last episode. The boat seen in these stills from the latest episode resembles the fishing boat used in Season 1. The problem with that theory is that Michael and Walt used that boat to leave the island at the end of Season 2. If this is that same fishing boat, it must mean that Michael and Walt have successfully reached their destination. Maybe now we'll actually be able to see an appearance by Michael and Walt in Season 3? I would love to know where they ended up.