What Raiga and the others did not know was that their whereabouts had already been exposed.
Thanks to Spandam's intelligence, Garen had long known that the World Government's top agents would come to Wano Country in search of Kryptonite. So he had upgraded the mine guards, who had originally been there merely for show, to a genuine Level One alert.
Any unidentified person attempting to approach the Sea Stone mine would immediately be recorded by surveillance Den Den Mushi, with the images sent at once to Garen and the other senior Alliance members.
Thus, while Raiga was still spinning stories for the guards at the checkpoint, the faces of his entire group had already appeared on the screen in Garen's office.
By the time Raiga, Bell, and the others had returned to Kuri City, Garen had already secretly followed them. He was sizing up this group of CP0 agents who had come to Wano Country to throw their lives away with ill intent.
"All units, get ready."
"The targets have entered the city. Actors, take your positions."
Garen had long since decided how to deal with this batch of CP0 agents:
He would first let them obtain the Kryptonite without trouble, then "discover" their plan at the critical moment and eliminate the leading top agent.
In the end, a few deliberately overlooked small fry would escape Wano Country by the skin of their teeth with the Kryptonite that the top agent had traded his life for, then present this hard-won treasure to the World Government.
It was somewhat roundabout, but the more troublesome the process was, the more credible the Kryptonite would seem. It would make the World Government believe more firmly that the stuff was useful.
So, to enhance its credibility and realism,
Garen had specifically devised an elaborate