What are the opening hours for pickup and return at Arlanda Airport?

The Lost & Found desk, operated by Smarte Carte, is staffed:

Outside these hours, please call +46 709 55 95 50 and allow 10–15 minutes for staff to arrive.
​Note: you must inform us at least 3 days before pick-up that you will be picking up outside of opening hours as this requires different handling by our service partner.