Over on the Fake Epiphone II thread, it is repeated "the best way to avoid a fake and get what you are paying for is to buy from a reputable, authorized dealer". You not only did this, but bought from a dealer who is also a friend.
Is is clear from the responses to this thread that most of us have never seen a Czech Epi, though most of us know they exist. And the first character in the serial number does look like a "B" when magnified. Sounds Czech to me!
Is the dealer where you bought it still around? If so, you might get the most accurate confirmation from him.