Well...
They did have a few holes in them, some areas were pretty thin. It looked like the floors rusted from the inside-out. It might have been moisture from wet carpet or something. The photo's don't really show it and I never took any pictures specifically of it. I did stare at them for quite a while, trying to figure the easiest way out, eventually figured, WTF ?!?! I planned on adding the Bad Dog frame rails because of the RB swap, it didn't seem like that much more work to replace the floors.
It really isn't that hard to do. (except for the burning skin and hair from welding upside-down)