The first clutch going missing is not un-herd of. Unexperienced parents might not have properly fertilized the eggs or they might not have been healthy & the parents picked them off. They will do better with the second clutch.
As for what they are, they are Occ. They have the dark eye ring & the overall appearance of them & the bands scream Occ. Its also not super clear but I count 8 spines.
Just a quick note on id'ing... Eye ring is not 100% because if the pic is taken with a flash it can obscure the eye color (like red eye in human flash pics) & dorsal spine counting is not 100% either because both true percs and Occ can have 10 spines. (occ 8-10, perc 10-12)