To order a return label by registered mail with PostNord within EU please follow the instructions below.
Choose your country and the option REK for registered mail with tracking code.
You will not get a tracking code if you choose the "Letter" option.
Fill in the weight of the return letter. Each passport is 50 grams.
Put the Consulate as sender, and yourself as receiver.
Link to PostNord Skicka Direkt