The package came with appropriate stealth, but it had the wrong contents. I messaged him (a super highly trusted seller) to let him know just a few minutes ago and explained in general terms that I received the wrong thing.
My concern is that he's going to ask me what I did receive. I don't want to describe what I did receive, because if I was LE then that is how I would confirm that the person who picked up the mail is the person that made the online order.
My second concern is that although the order was small (10-20), he will ask me to send back the things that I was not supposed to receive. I also do not want to do this, for obvious reasons.
How should I expect this interaction to go? Should I be concerned?
I should add that this is my first order on this particular site, so I am at trust level 0.
He will not ask you to send it back to him lol, guaranteed as that's horrible OPSEC.
Also you will have to answer what you received, that's just how it is. PGP everything, it's not LE.