Knox Crime Investigation Unit detectives are appealing for public assistance following a burglary in Wantirna South earlier this month.
It is understood an unknown offender gained access to a residence on Buchan Court sometime between 3pm on Wednesday, 5 November and 7pm on Thursday, 6 November.
No one was home at the time.
A number of personal items were stolen, including The Order of Australia medal and the distinctive Tobruk Rats medal, which was awarded in 1941 and is only one of 20 ever made.
Investigators have released sourced images of the medals in the hopes that someone can provide information on their whereabouts.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit an online confidential report at www.crimestoppersvic.com.au.