I just received a package from Seeedstudion this morning. It was declared as Gift with a value of USD 6. There were no customs fees, the package was not opened either.
For Switzerland for packages valued less than CHF66 (ca USD 57) the import duty is waived. Otherwise you pay the VAT (7.6%) on the total value of the shipment (including shipping costs) and a handling fee of ca $15. This is for properly declared shipments. If the shipment is held, because it is not properly declared (missing invoice) then additional delays and fees apply. I suppose customs check suspicious, as ‘gift’ declared packages occasinally and hold them if they think the declaration is wrong.
I suppose, if I ask when ordering Seeedstudio could declare the shipment properly, instead of declaring it as gift.