heh, not sure if this is possible in there, this is wrong but you can abuse the return policy?
but i would say, buy a new one, make the registry and in 1-2 hours later return the old one inside the box you bought...
say you thought this worked with DS games or make some shit like that it doesn't work with your linux computer or something bullshit like that
they will bitch about the opened box... and you may not get lucky...
but in some situations (like when i dumbly bought a copy of pokemon white thinking it was pokemon black, and only realized after opening the box) they will usually accept the return...
this is wrong, but i really hate that the device got a DRM on it.. if their website vanishes, the device is just trash unless some fans crack the drm