idk man, never hunted the marsh but from what it sounds like there has been a lot of open seats at some of the other marshes last weekend. Might be worth a shot or there could be 800 people, you just never know.
I would guess no. The last few times I've been there during the season there are plenty of locals who show up for openings and if they don't get drawn the they scoot to their normal spots. This is one of the reasons I don't go up for open slots during the season.