About "...something in a 4th dynasty tomb at Giza that might be related to Punt"
I knew I read it somewhere. A quick search brought this up:
The oldest known certain contact between Egypt and Punt, as recorded on the Palermo Stone, dates to the reign of 5th Dynasty king Sahure , who received myrrh and electrum from the land of Punt. Fragments from the decoration of this king's mortuary temple at Abusir are interpreted as a representation of the inhabitants of Punt. It is, however, possible that a servant shown on the walls of a 4th Dynasty tomb, is of Puntite origin as well.
Not much, but maybe we can trace down the specific decoration of this specific tomb.
Btw, thank you very much for the link to Von Spaeth's paper!!