If it had been them in place of Leger's group waiting for an ally, they would have left something wherever they went to leave a trail for their allies.
And, as expected, they found several things during their four days of investigation!
In a cave they passed, they collected abandoned resources and artifacts, among them a message from Leger's group, indicating that 10 of those who left Oqia had arrived in Uzira.
But there was nothing to show where they had gone, confirming the hypothesis that Leger's group had been attacked and forced to flee, if any of them had survived, of course.