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That looks like a stress curl. Ts do that after they have been through some traumatic event. Changing its enclosure will do it. Keep a full water dish and leave it alone. Your murinus will be fine.
Well at least he's not dead. Went out he moved. He now under a kind of wooden stump thing I put there. He's really not taking well to the arboreal deal .. He seems dead set on the burrow and hide lifestyle
Good. It can take a T anything from a few hours to a month or more to settle into a new home so don't worry too much just leave it now to make its home comfy.