Three raids on a house in Secret Harbour have allowed police to seize a wide range of what they suspect to be stolen property.
Although some items have already been identified, many remain unclaimed.
Detective senior sergeant Carlos Correia said he expected most of the items were taken from properties in Secret Harbour and surrounding suburbs.
Items included hard drives, tablets, jewellery and more.
Mr Correia said: “It's important that people fully describe what is stolen to the police, so we can identify it and have their items given back to them as soon as possible.”
He advised contacting the Mandurah Detectives Office with inquiries, at 9531 8888.