10 Del. Admin. Code § 202-6.0
Unless the Director is satisfied that a mutilated lottery ticket is genuine, no credit or prize will be issued to the holder of said ticket. The Lottery Office is not responsible for paying winning tickets resulting from any system or terminal malfunction or any other type of error. Tickets misprinted due to machine error or any malfunction or other type of error must be returned to the Lottery Office, and the Agent's account will be credited. If a ticket that has been sold to the public is determined by the Director to be misprinted due to machine error (as determined by Lottery internal procedures) or is determined to be erroneously issued due to a system or terminal malfunction or any other type of error, the Lottery Office shall reimburse the ticket holder for the cost of the ticket. Such tickets will not be eligible for any prize. The Director may require Agents to comply with such directives as he deems necessary for erroneous, misprinted, or mutilated tickets received by an Agent.
10 Del. Admin. Code § 202-6.0