Just report it give them the number and they'll refund you, it's literally just a box ticking exercise.
The time you've spent raising it with your bank (which will get your Amazon account closed if they issue you the chargeback) and drafting a letter you could have had your refund.
That was the plan anyway, I'm sick of Amazon tbh... If the item was actually of high value which according to them requires the police crime report reference number, why didn't they use the passcode like they did with other high value things I purchased in the past?
It really shouldn't be your problem. They have delivered it to the wrong address, or the driver has fudged the delivery. Until it is in your possession it isn't your responsibility.
This is my thinking, but at the same time, they need to provide evidence that they delivered. I had a similar issue with DHL, my parcel was delivered to incorrect address, thankfully 1 month before this happened I had a different parcel delivered from DHL with my an actual photo of my front door (this was enough for PayPal to refund me the full amount). Ebay, Seller and DHL were useless... DHL stated I'm not their customer so they can't help me. Seller was a big C... and Ebay just said that the tracking states it has been delivered even though I clearly stated, it has been delivered to a wrong address and the front entrance on the photo didn't match.
Just ring 101 , non emergency number , then get your ref number , i presume this is to deter people claiming non delivery when they have received it.
Easy mitigation - Photo evidence of delivery would have been plenty, like other courier companies do, or stick to the code you need to provide on higher value items like it's always been.
Edit:
I reported the crime, but didn't get a crime reference, I wonder how long that'll take... It seems like such a waste of police resources for something that could have been easily prevented, if Amazon wasn't so greedy and allocated more time per delivery...