Requirements:

Transport of Human Remains

1. 1.Certified copy of Death certificate
2. 2.Burial/Transit Permit
3. 3.Passport of decedent
4. 4.Embalmer's affidavit
5. 5.Letter of non-contagious disease
6. 6.Casket - sealer-type metal
7. 7.Air tray (wood base)

Consulates: http://www.state.gov/s/cpr/rls/fco/164195.htm#cambodia

Embassy: http://www.embassyofcambodia.org/