To my understanding, parents in Finland don't normally know the biological sex of the child before birth. If the box is given before the actually birth, then it makes sense to make the colors gender neutral.
Thanks for giving a definitive answer.
Note that my experiences with this are all in the US. Now that I think about it, in cultures where there is more pressure to have kids of the "right" gender, there are other really good reasons to not tell people the gender even if you know...
The box contents is neutral mainly for logistical purposes. It's cheaper to have all the boxes with same content than to carry two lines of blue and pink boxes :)