you might want to watch out for another scam type aswell
theres a type where you can setup a middleman trade where its you, your friend, and 2 other guys trying to scam you
one of the guys will be trading for your knife
what would happen is you would give your knife to your friend except one of the guys will change his name and picture of profile
he'll look like your friend but you'll accidentally give him the knife, the knife goes to the other scammer and you get nothing