I bought my ticket from Montevideo's Agencia Central online. They must not do many of these transactions. When I walked to the local station to confirm, I was not in the system. Maybe because my legal resident card is in my maiden name. Women in Uruguay do not take their husband's name. My legal residency and my passport do not match! I emailed the main office and they said they would contact Colonia Valdense bus depot. I walked a second time and it took approximately 20 minutes of chatting on the phone to get a ticket verified and printed out. Whew.