When exporting from Sweden and for post-registration registration in Lithuania, Latvia, Estonia, two documents are required: yellow and blue
Blue: For travel around the EU and abroad
Yellow: For re-registration, export and de-registration.
To check the information about the car, you need to go to the link fu-regnr.transportstyrelsen.se. Enter the machine number in the field "Registreringsnummer" and pass a test on the robot, as shown on the picture.
After that you will be able to see useful information about the car, as shown on the picture.