I saw that too, lovely looking bike, but the logistics (and cost) of getting it back from Poland, registering and insuring it make it very expensive for what it is. Plus as Miffa said, I wouldn't be parting with any cash, even a deposit, until I'd seen it myself or got someone reliable to check it out!
There are so many scams on the go at the moment, friends of mine in the US just lost $500 deposit after booking accomodation for the Olympics only to find the apartment they thought they were renting didn't actually belong to the company they had paid the deposit to!