Ask the seller to remove the slide and let you look at the firing pin. Those pins have a long (about 1/4 inch) "nose" that acts as the ejector. If that is broken, there is often enough left to fire the gun, but not enough to eject the empty case. That will also let you see if there is a firing pin spring guide; in many of those guns, it is missing.
Oddly, the standard FN commercial model is the rarest of those guns in the U.S. Due to an agreement between FN and Colt, FN did not sell any of the "Browning" pistols in the U.S. before c. 1950. On the other hand, the 1922 was used extensively by German military and police forces after the conquest of Belgium and so was a common WWII GI bringback pistol. Model 1922's originally used by other countries, such as Holland, were sold on the surplus market in the 1950's and 1960's; those are very collectible.
Jim