Ok, I don't know how the seller did it, but the keyboards arrived today. They both came with their boxes and wrapped cables, one of the keyboards itself was still wrapped, so this one is probably NIB. The condition of both is awesome.
They feature linear white NMB Hi-Tek switches, I would have preferred tactile/click switches but I can't complain for that price. They have a RJ12 connector and could probably be adapted to USB with Soarer's converter.
Does anyone want to trade the (probably) NIB one for a donor board with clicky/tactile switches? I'd like to keep the board within Germany though, since I think those keycaps are pretty rare over here.