The dam is a sable working line, and the pup is a sable. No Belgian Malinois in the pedigree. Sable pups go through a lot of color changes before getting their final adult coat in.
I would not buy this pup though, because the seller is lying to you about the reason the puppy is not registered. Nothing wrong with having an unregistered dog, but my worry is that if the seller and/or breeder is lying about that, then what else are they lying about? Are the parents as listed in the craiglist add really the parents of this pup? Or are they lying about that also?