[bunnyslippers]

After a while they again, replied with:

We were in contact with DHL in the meantime. There the handover to your hands was documented and also acknowledged with a signature from the recipient - i.e. you. Therefore, the order has been properly handed over and has become your responsibility.

They told me the same thing right at the beginning.

But you're not disputing the delivery, you're claiming the watch box was empty. Ask them why they keep reiterating a moot point