Okay. Ball in your court now.
Your garden shed gets broken into, and a lawnmower for which you don’t have a serial number is stolen.
There are no forensic opportunities, you have no CCTV, and because the theft happened overnight there were no witnesses, as you and your neighbours were all tucked up in bed.
What, exactly, would you have the police do? They’re human beings, not magicians. All you will ever get in those circumstances is a crime number because, in the absence of a crime pattern, evidence or intelligence there is nothing to investigate.