gotta love finding old tin. thats gotta be a very dry climate. around here that stuff would have returned to the earth by now. the "finds" around here almost always involve a barn or shed.
I agree with Dawg - The roof could be pulled & hammered back out. That roof ain't smashed - It's just a little dented!! That cab in the background looks like a keeper too.
That is a tricky label "abandoned" Not many people abandon real estate and if they do it usually still belongs to someone you need to get permission from.