Sensitive cargo? Where's the manifest?
Okay, due to the lack of a publicly released cargo manifest...
If the flight was carrying a consigned gold cargo:
50pax * (75kg + 23kg) = 4900kg
Gold is approx US$13xx/oz,
4900kg = 172842oz, therefore,
172842 * 1300 = US$224.7mil
One could agree that this could provide ample motivation, and enough to buy inside help and some media whitewashing too. Valuable or sensitive cargo needs to be ruled out publicly. The aforementioned figures are for example only, and intended just to highlight the scope of wealth that can be transported on such an aircraft.