[Synthx]

I would email him back saying that you accidentally missed one of the items, and tell him that you're really sorry for wasting their time.

Yeah I've thought about that but I sent photos of all the items in the box (apart from the sweatshirt I tried to get a partial for).

Nice one bro. Well, I would just tell them that you contacted the authorities, and they will investigate, and if they email you back asking why they haven't been contacted about the investigation, just make something up.