I can picture a thread Brad will start next week: "Re-scrounged some wood from my step daughter's lazy boyfriend...."
Maybe you should replace the good wood with a bunch of punk wood/dust/splitter debris and wait for the complaint. Sorry, naughty me is bubbling to the surface.
Well people rarely appreciate something that is given to them. Did they ask you for the wood or did you just deliver it to them. Especially if they didn't ask how they treated it isn't that surprising.
They asked for it. Having worked there for a week now doing the siding and observing them i understand why.