Unless the smith came into your house and took it without your consent, it is a civil matter.If he refuses to return your receiver you can call the BATF. It is stolen.
You sent him the receiver, he did not take it from you.
Now, some states will go with a theft charge if a demand letter is sent, certified mail, delivery confirmation. You have to give them a "reasonable" time to return the item, usually about 10 days after receipt of the letter..