Well guys...many of you know me and I could tell you evening stories about german customs
I would say you cannot do anything about this, other than try to have correct paperwork, don't declare a 2Kg package as $10 value and work even with some messages inside the Box.
In my Collector life, customs did open many of my imported stuff and 4x times it did happen to me, that they use razor knifes and cut into the bubble wrapped items. I ended up always having Steelbooks with deep knife cuts worst case on the front site!
This is all part of the dirty game if you import stuff. What works best for me, is if I get several items sent, have the Paypal receipt placed outside the Box, so with some luck, customs are charged based on the paypal receipt and no one does even open up the Box.
But I had all kinds of things. Some customs officers did "force" me to open (unseal) ALL Steelbooks in front of their eyes to see the inner content of the Steelbook.
So speaking for Germany, this is a bad game!
Cheers