I wouldn't be so worried if I hadn't read the confirmation e-mail I got on booking my order so carefully in the last few days. It says, and I quote: "Because of policies established by our clients, including venues, teams and theaters, we will not issue an exchange or refund for a ticket after it has been purchased, and we will not issue a refund for a lost, stolen, damaged or destroyed ticket or for a ticket claimed to be "not delivered".
I'm almost tempted to buy a new one, in the hope that that will get to me in time...