how can it not have a warranty?
Probably for the same reason as my Surface Pro 2, New Old Stock (NOS) I recently purchased new online in the US. It was an Asia Pacific model that shows Russia, New Zealand, Australia and Asia Support phone numbers in the "Activated" page. It activated OK, but I cannot get the Drive Image for it as it shows "Server unavailable from this location"
It shows my free 12-months of Tech Support as "Expired" The Warranty shows as April 2015, but any attempt to contact msoft using the Serial Number elicits a 'No longer supported" response.
Seems to me to be a country of origin thing. I am guessing that if someone physically in Asia, Russia, Australia, New Zealand etc., were to check using this serial number it would work until April this year.
However, like you, I am very happy with the NOS-SP2 and it is working just fine so I can live with the no-warranty status for the reason you outline. My guess is since the Nokia warranty is now a msoft thing, they are applying the same rules to it. BUT, interesting to know as I am trying to find a good vendor for a 930 as well and the ones I have found are all sourced out of Asia and "no Warranty" stated by the vendors.
Just guess mind you.