But he wouldn't need it back, if he already knew it to tell him in the first place (regardless of whether exists or not!).
Still think it's interesting that they specified Russian assassin who didn't get killed, although my cyrillic alphabet spot is probably irrelevant! Periodic table invented by a Russian, mercury and possibly U(ranium) featured, can't recall what the other samples throughout were, maybe code was insinuating a place on periodic table where element that could help with imagery techniques or other is?