The Mummy Returned

Ramesses II, was the 3rd Pharoah of Egypt and lived to be 96 years old.  He ascended to the throne in 1290 BCE and after his death, this great King was mummified, as was the Egyptian custom.   In 1974, the mummy’s condition was getting significantly worse and the Egyptian government agreed to let France take the mummy back to its laboratories for treatment.  What official documents were needed in order to transport the  mummy of Ramesses II to France?