For what it's worth, advice wise, open a dispute on eBay and send it back. It's adverting a 100% original black blaster and frankly it's not. So why let the guy off ? Just open the dispute and that way there is no debate and the seller has to cover the return costs. It's the correct way to send a message.
I'd say that disregarding the blaster costs is not helpful to the maths of the deal.
That all said, I've not yet encountered a German seller who was knowingly dishonest, so it might be a mistake you can work out.