The photos above don't say anything about the rust situation. Actually, any photos at all aren't great at telling you the rust situation unless it is very obvious. I wish I had photos of my TJ's old frame while it was under the Jeep. I could have posted them on here right before my frame swap and been given the go ahead to wire brush and paint by some people
I would be very very cautious buying a TJ sight unseen that has clearly been in the salt before. It might not look so bad, but you can't know until you see it in person. Being in Oregon, if there isn't a specific reason to buy this exact TJ, I would just find something closer that has less rust.