Recently, I have heard the surprisingly common whine that Khufu’s tomb is neither Khufu’s nor a tomb. Needless to say, this claim is ridiculous; a cartouche of Khufu painted by the builders of the Great Pyramid has been found in a Great Pyramid relieving chamber (Campbell’s chamber, the top-most). See here for original sketch (not meant to be a photograph!) of the cartouche bearing the name “Khufu”. See here and here for photographs of this cartouche. See here for a video of this cartouche. The marks on the west end of Nelson’s Chamber preserve Khufu’s Horus name, Medjedu. Khufu’s full birth name, Khnum-Khuf, is mentioned several times in Lady Arbuthnot’s chamber. Apparently, one cartouche bears only the name Khnum, though it must be remembered the Vyse sketches are not always reliable. For a debunking of nonsense regarding the epigraphy of the inscriptions, see here.
Also, mummies have been found in pyramids-parts of the body of Neferefre have been found in his pyramid, the mummy of Sesheshet has been found in her pyramid, and, apparently, the body of Iput I has been found in her pyramid. Others have probably been found before, but I am no Egyptologist and I do not know of them. In any case, there is no doubt the Old and Middle Kingdom pyramids are tombs, no matter how many bodies have been relocated in the several thousand years between the end of the Middle Kingdom and the nineteenth century.