Originally Posted by alenppc
My card was in a padded envelope and probably would not have gotten held by customs, but left in your mailbox.
You'd hope so, yes. However, German post knows that you can put a lot of value into a padded envelope, and even if there's no duties on computer goods, they still make you pay VAT (19% in Germany) if you import something.
I just picked up the padded envelope from customs. Wow - that was a long journey: Shipped on november 28th, 2012! In your case, all declarations were correct, and even the "repair/customs" field was ticked. It was just that the customs guys missed the signature on that declaration (field is empty), so the declaration is void.
Let's hope the journey back is faster.