If you’ve received a set of Eurostar or Thalys train tickets that appears to be incomplete— don't worry. The tickets you’ve received are valid for your entire journey. Your ticket will have either “Any Belgian Station” (ABS) or “Any Dutch Station” (ADS) written on it. Occasionally both terms will be listed for certain itineraries.
Although you’ve searched for and booked a specific route with GoEuro, only the Eurostar or Thalys leg of the journey printed on your ticket is for a fixed time. The journeys before or after the Eurostar/Thalys train leg printed on your ticket are flexible. The travel times stated in your confirmation email are only guidelines for your convenience.
The journey legs which are not explicitly listed on your ticket can actually be travelled at any time of the day on any train EXCEPT for high-speed or Thalys trains. This is why “Any Belgian Station” or “Any Dutch Station” is printed on your ticket and not the specific journey you selected on GoEuro.