Looks like an honest enough seller there, shouldn't be a problem. But why not avoid those insane shipping costs and buy it directly fro the google play store? Probably won't get it any cheaper, they ship very fast, and, if I remember correctly, for free.
EDIT: It's a good deal imho though.. Don't know about Norway, but I got my 8GB N4 for 300€, your offer there equals ~294€ for 16GB. Of course you have to add the huge shipping costs and the nerve it'll cost you to wait at least 2 weeks for your N4. :P