Unless I am mistaken, there are no records of bodies being found inside the pyramids. Yet, if you ask Joe Schmo on the street he'll say they are tombs. Is the archeological community split on this issue? If they are not tombs then what are they?
But the remains of bodies HAVE been found in pyramids, as well as artifacts that were only ever present at burials. The pyramid burials, like other funerary sites, were very often looted for the grave goods, which is why so many of them seem to be empty or nearly so. This article can tell you a lot about the Egyptian pyramids and their historical use as funerary sites.