Yes, this is quite legit. 1C are the publisher/distributor for the world outside North America. Cenega is their subsidiary in Poland - and the Poles have been one of the largest buyers of boxed copies of RO1 over the years (it has been suggested that it is something to do with the fact that they get to kill Germans AND Russians in one game).
1C ran this by us - I told them firstly that NO copies with Enemy at the Gates ever go near Russia (we'll be lynched) and, secondly, we want a bunch sent to the office in Roswell!