I still don't understand something about the Philosophers' Legacy.
Volgin found Tatyana stealing it in the underground vault of Groznyj Grad.
Then he gave it to The Boss.
Afterwards The Boss gave it to Snake.
Finally we saw Tatyana on her bike with the micro-film (it seems that she has stolen it from Snake).
BUT when Snake listens to the tape Eva left, he still has got the Philosophers' Legacy !
And the phone conversation with Ocelot reveals that EVA has got a fake one.
Could someone help me on this ?