It may not be of prime importance; but in a matter like this, where all is unknown, we must take it that everything is important.

I cannot think that in a matter worked out with such extraordinary scrupulosity such a thing should be overlooked.

As you may see by the ground-plan of the tomb the sarcophagus stands near the north wall, with the Magic Coffer to the south of it.

The space covered by the former is left quite bare of symbol or ornamentation of any kind.

At the first glance this would seem to imply that the drawings had been made after the sarcophagus had been put into its place.