The Gospel of Judas on Sale?

In their new book Bible Nation: The United States of Hobby Lobby (Princeton University Press) Moss and Baden report that in 2010 there were negotiations for the acquisition of the Gospel of Judas by the Green family that never went through (p. 86). This apocryphal Gospel is preserved together with other texts in a famous and much debated papyrus codex, which passed from one owner to another, was in part dismembered, and ended up in the ownership of Frieda Nussberger-Tchacos. This dealer, who has had many vicissitudes in her professional life, entrusted a foundation (the Maecenas Foundation, directed by her lawyer, Mario Roberty) to sell the copyrights of the codex to the National Geographic in order for the codex to be studied and become accessible to the public (besides producing a substantial income for a number of people, including the self-defined modern Maecenates). According to the National Geographic and other sources, the codex is meant to be restituted to Egypt (precisely to the Coptic Museum in Cairo) after its study and publication.

So I wonder how can it be possible that this manuscript which belongs to Egypt was offered for sale to Steve Green?