your best bet is to take them to the venue day of event and ask the box office to verify them, but all the box is going ot do is check to see if the barcode is legit and if they have entered the building already or not.
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How to verify your tickets are real. If you've purchased your event tickets through an official source like the venue's website, box office, Ticketmaster.com or its mobile app, and Ticketmaster's resale platforms, your tickets are genuine, and your transaction is protected.
Show Your eTicketOpen the eTicket on your mobile device and show the barcode to the conductor. You can even print your eTicket before you arrive at the station.