How can I get the original Sri Lanka Railways train ticket?

The 12GO voucher can be shown as printed or screenshot on a suitable electronic device, along with the passport at Stef Lanke, Office No. 7 in the Welikada Plaza Building.
GPS Coordinates 6.9092441,79.8954407**
Monday to Saturday 9:30 – 18:30, Sunday 10:00-13:00.
The Rajagiriya bus stop is a 200m walk from the office.
The public buses that stop here are 144, 176, 177, 171, 174, 175.

As well, you can request to deliver the tickets to your hotel for the additional cost, USD 10. The delivery option can be selected during the checkout process when you make the booking. Please enter your hotel address, phone number, and check-in date into the “Additional Notes” box.

Tags: Sri Lanka, Sri Lanka Railways

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I don't have a booking number. I have not purchased a ticket yet.