We'll see... the seller is not a "small" retailer, just take a look at their store:
http://stores.ebay.com/Datavision-Computer-Video

Texrat: Do you have insider information to who Nokia has made shipments of the preproduction units? Is there any specific country/factory where pre-production units have been built?

Any chance to tell by looking at the serial number of the unit? (I think it is the MAC address but each factory must have been assigned different MAC address range to use, and can be tracked back to the factory.