Answer: What a sad chain of events for your plants! I agree with you that the original wilting was probably due to transplant shock. Generally shrubs will perk up once they acclimate to their new homes. But, a late snowstorm can cause dieback of even a healthy shrub. I still wouldn't give up on the plants - not just yet. You can prune away the obviously dead plant parts. Cut the stems and branches back until you find live material (green tissue in the center of the stem). New growth will begin behind the pruning cuts you make. If you find no green tissue in the branches and stems, then I would conceed that the plants are dead and should be replaced.
Let's hope they're still alive!
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