Just a thought - Petrie's original report on Ranefer's tomb at Meidum mentions separate viscera:

"In the recess in the south end, similar to that in Rahotep's chamber, there were parts of the internal organs embalmed, forming lumps of resined matter wrapped round in linen, and fragments of such were in Rahotep's recess. Some insect had lived on it for generations, and the place was deep in the cast skins. There was no sign of these organs having been in jars or enclosures ; and it seems as if these recesses in the tombs were intended to lay the internal parts on after embalming, before the use of jars for such was introduced."

And yet, the wiki for Ranefer mentions a canopic chest, as does Ikram and Dodson's 1998 book, which I don't have to hand, alas. Did the assertion of a canopic chest come from a reanalysis of the tomb contents? If so, is it possible that the tomb contents, including the viscera, were not destroyed along with the mummy?