A.T. Robertson Commentary Luke 24:23

"and when they found not his body, they came, saying, that they had also seen a vision of angels, who said that he was alive." — Luke 24:23 (ASV)

Had seen (εωρακενα). Perfect active infinitive in indirect assertion after λεγουσα. Same construction for ζηιν after λεγουσιν. But all this was too indirect and uncertain (women and angels) for Cleopas and his companion.