*If* that's the case, they will probably arrange clearance ahead of time by informing customs as to the exact nature of their goods.

You are required to send a prior notification according to Swedish customs: http://www.tullverket.se/innehallao/f/foranmalanavvaror/foranmalanavvaror/summariskinforseldeklaration.4.746caaf2118a74da0328000192.html

The shipping/courier companies will take care of this for you. If you bring the commercial merchandise you have to make sure you do it yourself. Again, hopefully KnC have already done this. If not there's still time to do it.