Police do not investigate lost property incidents however you may be eligible to create a lost property incident report which you can reference for insurance purposes.
If an item is located, handed to police and matches your report, you will be contacted via the details you have provided.
The onus is on you to exhaust all avenues of enquiry.
Contact police on 131 444 on in person at your local police station if you are reporting lost property that you have found and are not the owner.