Wednesday Boy
The Nerd WhoFell to Earth
I would let the players do what they want with X and bide my time. I would have repeated interactions (positive, negative, and neutral) between the players and the Three Organizations to cultivate relationships between them. I would make sure I understood the motivations and methods of your NPCs and wait for your players to present your NPCs with an opening to get X.
For example, your players might reveal they have X by starting a bidding war for it between the Three Organizations. Perhaps one of your players will develop a positive relationship with one of the Organizations, join it, and become interested in giving X to that Organization. Or perhaps one of the Organizations will become adversarial to the group, take out their vengeance on the player's father, and discover he was holding onto X.
My bottom line recommendation is that you don't know how the plot will unfold, so don't try to predict it. Sit back and wait for the players to unfold the plot for you and have you NPCs act when they see an opening.
For example, your players might reveal they have X by starting a bidding war for it between the Three Organizations. Perhaps one of your players will develop a positive relationship with one of the Organizations, join it, and become interested in giving X to that Organization. Or perhaps one of the Organizations will become adversarial to the group, take out their vengeance on the player's father, and discover he was holding onto X.
My bottom line recommendation is that you don't know how the plot will unfold, so don't try to predict it. Sit back and wait for the players to unfold the plot for you and have you NPCs act when they see an opening.