Unfortunately, I can't answer that as I haven't used it. However, in my opinion, opening the packaging has nothing to do with the service, as Apple cannot determine whether the packaging has been opened.
Thank you for pointing this out, I will forward the incorrect specification to the relevant department for rectification. The Apple Watch Ultra 2 only has the function of measuring blood oxygen.
So first of all: iWatch does not exist, this is the Apple Watch. And no, Galaxus does not take back used items. You can try to sell them either on platforms like Tutti or Ricardo, or to buyers like Revendo. But I can tell you that you won't get 100 more for it, not even for the most expensive version.
But I can highly recommend the Ultra 2, I'm thrilled!
EAN code has nothing to do with EU. The watch is for the German/European market as it has a functioning blood oxygen app, which does not work in the USA, etc. due to licence disputes. You can recognise the country of manufacture or the country of distribution from the EAN code.