The person - who is in his 20s - is suspected, among other things, of having re-addressed several packages and then having a helper in his 15s pick them up.
The packages have contained, among other things, electronics and mobile phones, and are estimated to have a total value of approximately SEK 800,000.
The suspect was revealed after Postnord's security department became suspicious and began monitoring the person on camera, according to P4 Västernorrland.
The person is also suspected of attempted gross fraud, as a result of an unsuccessful attempt to re-address a package worth approximately SEK 130,000.
Three more people are also suspected of fraud, because they chose to buy the goods.