Don't kid yourself. They'll self-destruct within 2 or 3 years. He sanded them in the wrong direction. Once he applies the finish there's going to be a spontaneous reaction to the latent negative energy created by the lack of Woo which resulted from the yang-only sanding but no ying sanding. Sort of like wax on/wax off, but he only went through the wax off cycle and never any wax on.
I hope he doesn't warranty them he'll be in the poor house putting out all those fires. Oh and that's another thing, they could very well spontaneously combust!