Requirements:

Transport of Human Remains

1. Certified copies of Death certificate (3)
2. Burial/Transit Permit
3. Passport of decedent
4. Embalmer's affidavit
5. Letter of non-contagious disease from local health authority
6. Funeral home letter stating: 1) only remains are inside the casket 2) flight itinerary; 3) consignee's name, address, and telephone number;
7. Hermetically sealed casket
8. Casket air tray as outer wood shipping container

Transport of Cremated Remains

1. Certified copies of Death certificate (3)
2. Cremation Certificate
3. Urn placed in an outer container

Consulates: http://www.state.gov/s/cpr/rls/fco/164208.htm#nauru

Embassy: http://www.embassy.org/embassies/nr.html