Should Berlin Lend Nefertiti to Cairo?

In a situation reminiscent of the Parthenon Marbles contretemps between the British Museum and Greece, Egypt is asking the Altes Museum, Berlin, for a temporary loan of its famed bust of Nefertiti. Both museums are understandably leery of lending to nations that have previously insisted that ownership of these antiquities should be transferred to the source country.
Agence France-Presse reports:
[Culture Minister Bernd] Neumann and the Altes Museum in Berlin have rejected Cairo’s calls for a loan, saying Nefertiti was too delicate and valuable to be transported.
Zahi Hawass, director of Egypt’s Supreme Council of Antiquities, suspects the real reason behind Germany’s refusal is the fear that Nefertiti will never be returned—a fear that he asserts is unfounded.
Yet, it was just a year ago, at a press preview at the Metropolitan Museum, that Hawass listed the bust of Nefertiti among several supremely important Egyptian antiquities that, as he then told me, he would insist on being permanently returned to Egypt. He made the same threat then that he is making now, this time as his fallback position if Nefertiti is not lent—the creation of an alliance with other source companies to demand the return of key works.
Is it any wonder that Berlin might be loath to lend?