Update: I spotted at least 3 of the big goldfish swimming in the bottom of the pond this morning!! By noon I couldn't see any. So despite the lack of hiding spots in my pond, they seem to have found some spots where I can't see them for long periods of time.
My assumption is that the sudden temp drop, and the extreme rainfall (3+ inches in 3 days) caused the pond to get cold too quickly, and maybe shocked the fish?
I am excited to know that they weren't taken in the great fish Rapture of 2022. At this point, I suspect they are all alive, but hiding. I guess I'll know more when the weather warms the water back up.