Here is one of those utterances that are rather enigmatic because they are so short and were obviously read to a crowd that could see exactly the context so would be sensible to them.
432a. To say: Thine honour is effaced, O white hole, by him who has escaped the fnt-worm.
432b. Thine honour is robbed, O white hole, by him who has escaped the fnt-worm.
Perhaps this was the ritual recited in the king's chamber when the king's ashes were placed in the sarcophagus. Perhaps "white" simply refers to the ashes.
I don't know. This isn't extremely convincing though and I still doubt any funerary function for the great pyramids.