Thank you everybody for the suggestions and exchange of experiences, I just wanted to write a small update.
I decided to ship back the device to the seller at my expense : DHL Italy to China, 41 Euros. I'm not familiar with shipping/returning items overseas, and the procedure was foggy to me, so I declared that the item was a broken eBay item returned to the seller, and specified eBay item and transaction number.
At that point, I was the one deciding what the value of the item was, and since it was broken, to me it was worthing 5 USD.
The box has arrived at the DHL Customer Service in Guangzhou, China in less than three days, and then the tracking stopped with :
"
Paperwork is required from the importer to continue with the clearance processing. A DHL representative shall attempt to contact the importer for the required paperwork. Customer should contact DHL Customer Service if not reached by DHL".
Although I included the phone number the seller provided to me, useful to DHL to contact him, I decided to write twice to the seller, asking him to contact DHL, but
in 5 days that the the box is "frozen" at the Custom the only reply I got was "
we'll see".
So after 5 days I decided to ask eBay to step in.
Now, if I browse the object, it says : "The dispute is still ongoing, we will contact you".
I think it useful for you people to know, is that since a "return" was ongoing at the time of shipping and the transaction was originally paid with Paypal, I asked the latter a refund, and after examining the request, they've sent me back 30 Euros, which is the maximum shipping expense refundable.
Will keep you posted....for now, sorry if my english is inaccurate, but it is not my first languange, plus it is late and I'm tired...

'73 de I3APR
Andrea