One thing this article didn't make clear is that Maverik has a policy in it's employee handbook that the employee who made the mistake is financially responsible for reimbursing the store for the ticket.
Now, the Statesman article says Maverik Corporation claims to have eaten the cost on a great number of these tickets. However, I remember going into a Jacksons store and a clerk begging me to buy a $5 ticket one of her customers had rejected. She said her store required her to buy these tickets, and was nearly in tears, said she couldn't afford to buy another lottery ticket. So, if the attorneys for the clerk who misprinted the ticket can prove that Maverik has ever required an employee to pay for a rejected ticket, I think that clerk may have a case.