I just received it in the mail.
I will translate their reasoning that they stated on page 2. It begins with the sentence after the ticked box:
"Devices which are regulated by the EMVG (Law for the electromagnetic compatibility of electronic devices - EMV-guideline 2004/108/EG) (for example household electronics, electronic tools, lighting devices, IT devices, entertainment electronic):
-The product is missing the CE-mark (EMVG §18)
-The product is missing details about the manufacturer (EMVG §9(2)) or the importer (EMVG §12 (1)). Because of this commisioning is not allowed.
-A German manual is missing (especially with a guide for safe first time commisioning)- thus the manufacturer withholds critical information for the safe and proper use of the product (EMVG §19).
Concluding I ultimately deny your request for release of the goods for free circulation."
I want to go over these quickly.
1.CE-Mark:
It has to be the cable. As said, the official of the Bundesnetzagentur told me that you dont need such documents for parts like cables (without termination), capacitors, resistors and so on.
2.Contact details of the manufacturer:
As I also said before, this is non-sense because the manufacturer is also the sender. Thus you already have the contact details.
3.German manual is missing:
I mean, 99% of the people under the age of 60 can speak English here, so it doesnt have to be in German. Additionally I already have the manual and it is also included on the CD.
Overall the only valid point they have is the cable and I told them on more than one occasion that they can just throw it in the trash.
The rest of the arguments are simply false.
I am already filing a complaint against my customs office. Wont change anything, but I need to tell someone who is responsible there about this idiocy.