I/O
As weird as it may seem, its more likely someone lost their"lucky" round. Or they went to the pistol range and that round got lost in the bottom of a pocket.
Getting an unspent round out of a pistol clip takes technique or an act of Congress. Typically if there is one in a revolver there are six, so this was probably a stray. A girlfriend gave me a keychain made out of an unfired 9 mm (gunpowder is drained). Needless
to say, that stays home when I travel.