Looks like a lot of wood… http://dallas.craigslist.org/dal/zip/5259705427.html
That’s at the old Texas Stadium site. Meaning we paid for it in taxes.
I couldn’t really tell from the photos, but that may have been used for concrete form work. Beware of adhered concrete and broken nails, which will make short work of anything with a sharp edge.
Not likely, they typically don’t use 4x4 & 4&6 for forms, more for shoring/cribbing. Its certainly the right price. I think they may have used it for the old concrete bridge beams & concrete bridge decking.