The weapons themselves are a bit pants so you might not think they are the right ones. The others, the post master should send them. But you only get the message once per account. Dunno how the choice is made, think it's the first char you log in with. Keep in mind that if you made a char / logged in but deleted before getting to the Tower, the mail is lost. Happened to my warlock and the special shader and exotic. Trying to see if bungie might get them me again