from ticketmaster.com:
If you do not receive your tickets within 3 business days prior to an event, or you notice your tickets are missing or have been destroyed, call your local Charge-by-Phone immediately. Tickets for reserved seating events that are lost during the delivery process from Ticketmaster to you, or that are missing or have been destroyed, may or may not be replaceable at the discretion of Ticketmaster. If your tickets are for general admission seating, or if your tickets were purchased using cash at a Ticket Center, whether or not to issue to you replacement tickets will also be at the discretion of Ticketmaster. However, in almost all cases replacement tickets will not be issued for general admission seating or for tickets purchased using cash at a Ticket Center. Be prepared with the confirmation number for your account, or the purchasing Credit Card. The operator will first verify whether the tickets are replaceable, and, if they are replaceable, then instruct you as to where and when to pick up your replacement tickets. This is normally done at the Box Office prior to the show, and the tickets are marked as "Replacement" so that they are easily identified as the valid tickets, however Ticketmaster may require you to follow a different procedure in order to obtain the replacement tickets. If replacement tickets are to be issued, then we may require that they only be picked up by the person whose name appears on the credit card used to purchase the tickets and that that person must present the credit card used to purchase the tickets, along with a confirmation number and valid photo identification. In some cases, a replacement fee may be charged.
Tickets should always be treated like cash. Keep them in a safe place, away from direct heat, sunlight, and moisture. Be sure to store them where they can easily be found again. Tickets are printed on heat-sensitive paper. Any contact with higher temperatures will cause the ticket to darken or turn black, so please keep this in mind when storing. Do not attempt to laminate tickets.
Black tickets?
We use a thermal printing process that makes ticket surfaces sensitive to heat. If this happens, contact us as soon as possible so we can verify your order and seat location and attempt to make alternate arrangements for your entry into the event