The instructions for Panel Doctors can be found online at
http://www.immigration.govt.nz/NR/rd...30July2012.pdf
Page 32 says "It is not necessary for the medical examiner to seal this envelope"
There is no mention of needing to include the x-ray film, only the certificate. The only exception this this is found in section B9 where it is talking about people with active tuberculosis or another lung condition. "Where an X-ray film is included please include the envelope with the medical certificates in the X-ray envelope." Under normal conditions all that is required is Chest X-ray Certificate (INZ 1096) to be completed.