Maybe the person who sold it to him wanted to have it be untraceable.
I noticed that he wrote “you caused me to do this”. How could the parents not notice that he needed serious help? Sure he was a young adult, but crikey, what is family for but to tell you what you need to hear?
The guy who sold one of the weapons posted about selling it on the net yesterday afternoon. He was relieved that all of his paperwork was in order.