Two male helpers, also in their 20s, are sentenced for, among other things, aiding and abetting aggravated fraud, embezzlement and aggravated theft.
The penalties will be a suspended sentence with daily fines and community service.
Two women who picked up the packages with false labels receive 40 hours of youth service.
It was at the age of 15 when the crimes were committed.
The former postal employee must pay damages to the electronics company and to Postnord with just over half a million kroner.