Without seeing a stamp or a sticker, its going to be near impossible to verify. During the same period, many manufacturers made the same style of wheel. Mesh is very popular. A nice set of Appliance/Western mesh should run you the same price as any of the Enkei mesh. They are a wanted rim, but not rare by any means so prices are decent.
Depending on base price from overseas, it might not be worth it to pick them up and just look for a local set. If they are the same shipped, then its not going to really matter... they are basically all the same wheels so price should be your determining factor.