There is a limit to how much cold the plant can take. If exposed to below freezing temps for more than just a few hours, it can cause serious damage. Limp, translucent pads have been cold damaged and should be removed before they rot. Water very lightly, keep right around 60F in bright but indirect light and hope for the best.

Sorry you had to learn this the hard way, but this is why most folks don't buy or ship plants during wither w/out using heat packs. It's just too risky.

These in particular, are tropical plants, not reasonable to think they'd survive several days of cold temps, especially freezing or below.

Why are you so sure of this?

"somewhat translucent. I am sure it is dehydrated or lacks light."

Do you know these plants? I believe the translucent look is post-frozen & that's unlikely to be salvageable, sorry.

Translucent is frozen. Like has been said remove the translucent pads. If most of the plant is translucent consider disposing of it. Schlumbergia should not be shipped in the winter.