When someone contacts you about a racket, the first thing you should do is run their email, user name and real name, if known.
If you had done that, you probably would not have wasted your time. The kid has sort of a checkered past on this board.
Delete the real name and phone number in your last paragraph or the thread will probably mysteriously disappear.
You can leave the email address, make sure it is right, are you missing the w in matthew?