[Sultaan]

Yeah. I'd not blindshot my first SE on something that costs £450. If it goes wrong, there's always a bad worst case scenario. Its all about being confident about your story, make a plan for what happened. If it's a phone. I woulden't say empty box, because Amazon UK have started weighing parcels for high valued items at depots and then weighed again when being delivered. I had an issue like that where they told me that the item was in there as the weights had matched at the warehouse and at my address. I had a nice rep and got out of it by saying that I didn't realize that my wife had taken it out and she didn't tell me, I got lucky escaping that.
Since its a phone. I've had no issues always reporting that the battery exploded or got really hot to the point where you had to dispose of it. You'd need to research more on that. I just uploaded a post on that method, and some tips, check that out, but I haven't done large items before. I have done the most at £100, you'd have to consult with someone who's more experienced, there's plenty here.