Potaka said the lack of identifying marks on property still not returned to owners highlights ongoing difficulties getting stolen property back to where it belongs, and it is also impeding investigations.
"We are reminding tradies and people generally all the time," he said.
"Mark and name your tools, don't leave them in your unlocked truck overnight."
There has been an increase an increase in thefts of tools recently, with more than $10,000 worth of tools "often stolen in one go" according to Detective Stephen Leonard.
"If your tools can't be identified, we can't get them back to you and we can't hold the offenders responsible," he says.
Potaka said the continuing problem is "quite depressing".
As a result police are offering an engraving service, through appointments that can be arranged by ringing (06) 8730500.