how to spot a clone box

Hi I recently bought a vu duo, definitely a genuine one, and i love it that much I'm just about to buy a another used one. But on pop. auction site there are 3 secondhand duos for sale, all claiming to genuine box's, but none of them have the dolby digital logo on the front (i'm told the genuine ones do). Even one of the new boxes on there (price seemed to good to be true) doesn't have the dolby digital logo on it but I asked the seller if it was genuine and he said yes it was with 1 year manufactures warranty. Can someone tell me the other ways to tell a genuine from a fake please?? Pics would be really useful!
 
Back
Top