Giza was the site of a royal burial ground from the days of the Early Empire and the desert landscape is dotted with numerous mud brick tombs and mastabas (stone tombs with flat roofs), though they are by no means as impressive as the pyramids themselves.
There are no mud brick tombs anywhere in the desert. 
mnli hypothesis: There are no mud brick tombs anywhere in the desert.  premise: Giza was the site of a royal burial ground from the days of the Early Empire and the desert landscape is dotted with numerous mud brick tombs and mastabas (stone tombs with flat roofs), though they are by no means as impressive as the pyramids themselves.