After looking up the tracking info of the package, I discovered, that the provided tracking-ID of the replacement unit seems to point somewhere else but not my address, because the tracking info shows a different city now. I called DHL Germany about the whereabouts of my package, whose tracking-ID had been provided by the seller
flyxy2015 on ebay. The lady from the DHL customer service told me (to my surprise), that the tracking ID belongs to a completely different customer in a different city in Germany. Seems that the seller
flyxy2015 had probably provided an existent but
"fake" tracking ID based on my previous complains, knowing, that China is far away...
I contacted the seller
flyxy2015 by the ebay messaging system today again and asked about the "real" tracking ID of my package, but after looking casually around on the internet, it seems, that the seller
flyxy2015 has been known already before as a cheater on those things like the tracking ID in case of complaints. Thus it would surprise me, if I would get any answer from the seller. Unfortunately the 60 days period has passed already on ebay, so I can't leave any negative comments about this behavior. Probably the actual intent of the seller...
So I suggest, that anyone, who reads this, is
staying away from this seller.
If any further news will show up, I will post here.
Fortunately PayPal seems to be of some help in this situation, so not everything is lost