From Australian sf information
:6.5 Votes for nominees not listed on the official ballot will be invalid and no additions or alterations to the nominees will be recognised.
The Physical Nature of the Trophy==:7.1 Finalist Certificates: All finalists shall receive an A4 certificate honouring their achievement.:7.2 The Trophy: Ditmar winners shall receive a standard trophy.
==8.0 Appendix: Possible Future Changes==