AIBU to search DS16's mail

[MyQuaintHedgehog]

DS16 makes money by doing tutoring. He's started ordering items online, most of the time they are from popular retailers such as amazon but sometimes they are from unknown retailers to me. There's been an influx of online orders by him recently. I've temporarily withheld his most recent package and I'm asking him to explain what he's buying. He said that I am being intrusive and it's "none of my business". I don't know how to proceed. I respect his privacy and so don't want to go through his mail however equally I am entitled to question what hes buying; teens like to experiment and push boundaries so chances are it could be something he shouldn't have. How should I proceed? Should I hand over the package to him or AIBU to at least question his purchases? I don't want to invade his privacy but equally I want to maintain safety.

DD has been ordering her own stuff since this age, and I’ve never looked. From what I can tell it’s mostly skin stuff, game collectibles, and key rings / charms.
I trust my child to not be ordering Machetes and Crack

MY mum used to do this and try to listen in on phone calls in the landline only days when I was 16 /17.

This seems very unlikely.

bladed articles (knives and the like) are quite strictly controlled.

illegal drugs don’t normally come through the mail.

porn is usually online these days.

what on earth do you suspect him of ordering?

I wouldn't do it out of mere curiosity, but I would if I had reason to think he might be ordering something I would not be prepared to have in my house.

Oh look, another weird thread from a user with a random "three word" username that plops and runs...

Actually, I think I recognise this one, or similar, for similar such nonsense posts...

But no one in this country actually says, “the mail is here.” We say post.

I say Mail.

Interesting answers. The parents of the Southport murderer were criticised for not questioning his packages of knives and substances. Likewise parents can be charged with terrorism offences if their, under 18 year old is having bomb making substances delivered to their address. So on the fence, but I'd want to know.

I say mail too. We also have a mailroom at work not a postroom.

This is the Night Mail crossing the border.........

WH Auden 1935