Got my knife in 8 days - I live in Australia
I think it might be because it is a knife and our customs scrutinize anything that could possibly be considered a "weapon". We have very strict laws regarding this.
Maybe a clear description stating this could help things along.
I get knives from Germany with a description of "cutting tool" or "Kitchen Cutlery" all true descriptions of what it is. Just stating that it is a "knife" begs customs to investigate further and to make sure it complies with regulations and thus prolonging time at customs to clear.
I would imagine that "Japanese style kitchen knife" would also be good, considering your range of knives.