Now that we're all discussing this, it might be a good idea to reference the DE criminal code that CBmarine mentioned (below) right on the receipt. Could be helpful.
11 Del C. § 1448A Criminal history record checks for sales of firearms.
(e) The provisions of this section shall not apply to:
...
(5) Transactions in which the potential buyer or transferee holds a valid concealed deadly weapons license pursuant to §§ 1441, 1441A and 1441B of this title; and