Hi Kristi,
Those were not cocoa fiber liners but dried up sphagnum moss. Those in the basket are the duplicates, the mother plants are also freezing in their containers outdoors.
I just leave my succulents outside to fend for themselves. I think as long as there is good air circulation around them, good drainage and good sunshine on a cold day, however cold it is, they survive well. They will go stressed for awhile but bounces back when warmer weather returns. But I do worry when it starts raining for several days, always keeping my fingers crossed that the succulents will endure. Luckily the past couple of weeks has been cold but dry, so my succulents are coping well this winter.