Varian explained his findings in the ruins and Sia personally showed the metal leaves.
After verifying the evidence, Bali wiped the sweat off his forehead as he took short breaths to calm his pounding heart.
When Pluto was conquered, Neptune Sovereign's artifact was lost. Now, Kreo's artifact—which was supposed with him until his death—vanished under the nose of all that heavy security.
If it was only the loss of Neptune's artifact, Bali could still convince himself that this was a conspiracy theory.
But the loss of Kreo's artifact was something he couldn't ignore. While there's a possibility that one of those level 9s stole the artifact, it might as well be zero.
There's no use for them and it's impossible for one person to steal under the gaze of that heavy security. What's more, there wasn't one faction of the military at that time. There were multiple factions, even hostile ones.