You can clear goods yourself by visiting a customs office.
Normally, the shipping agent that transports the goods, such as Posten, will declare the item for the procedure for release for free circulation on your behalf. The shipping agent will charge a clearance fee for this service.
If you clear the item yourself, you may avoid the clearance fee to the shipping agent. In practice there is little or nothing to gain by doing this, as experience shows that the shipping agent, in any case, will charge you for the storage and processing of the shipment.
If you wish to declare the item yourself, you must notify the shipping agent to avoid that the shipping agent performs customs clearance automatically. You must enquire with the online store as to which shipping agent is transporting the item.
How to clear the item for the procedure for release for free circulation yourself
You can clear the item by visiting a customs office. You will receive assistance with submit the item for the procedure for release for free circulation. The item must have arrived in Norway and placed in customs storage. You will not have the item with you. It will be in the shipping agent's customs storage.
When you visit the customs office, you must provide:
invoice (or receipt, bank statement or similar that shows the value)
shipping documents (these may be obtained from the shipping agent that transported the item)
an arrival notice indicating that the item is located ina customs storage (this can be obtained from the shipping agent/customs storage facility)
any permits or licenses if the item is restricted. More information about this here.