This might have a lot of hidden rust. I see a bunch of small holes in the trunk lid, rockers, and a few small holes on the bottom part of the doors. It's drivable though, and he's a got a huge stack of paperwork to go with it. Looks like all the receipts were kept from day one. Plus, the rest of the car has a really nice patina to it. Might make a good daily driver if you're willing to put some time into it to keep the rot from getting any worse. 

https://austin.craigslist.org/cto/d/1957-dodge-coronet/6735204196.html