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I would keep Butch on the same bedding/substrate he`s been used to supamouse as sometimes sudden change can cause reactions like this, although with paper based products that shouldn`t happen. He is a good age though and sometimes bodily changes can affect their skin and emotions. Keep stress (if any) to a minimum where you can.
It`s the big day now so can`t wait to hear how the newbies are doing. x
If they seem happy and confident I think you can start handling them straight away.
They sound absolutely adorable.
Little munchkins! Hairless mice do tend not to be nude. Nude mice have no fuzz or fur at all. Hairless mice are actually born with hair and then they lose it due to a gene they carry.
I agree about small handling sessions but I would keep things short so as not to cause the newbies any unnecessary stress as they settle in. Remember they are young males so they will still be sorting out who is who and what rank they hold. x