[Tarana]

Referencing the ethics, unless you agreed to something in advance, the review units are a gift that the reviewer can do with what they wish (sell, toss, donate, use, recycle). The only issue I have is that it is not in the description of the units being sold that these are used. It doesn't matter how they were acquired so long as they aren't stolen. If someone is dumb enough to pay retail for a used and out-of-warranty device, not much to be done about it.