I've only heard good things and praise about him from people who have met him.
Can they send her a registered letter and see if she signs for it herself?
If she can't sign for it herself is she thus disqualified to be a Justice?
If John Roberts sends a registered letter, in front of a postmaster, handing it over, and then instructs postal authorities to go and deliver it to RBG there is no work around other than she'd better sign the letter herself because those are all trusted people.