The chair thieves nearly panic when Stottlemeyer simply touches the chair. They are, understandably, very concerned that it does not get damaged. Why then did they carry it out of Nana's house with her sitting in it? The thing is supposed to be over 200 years old. Would they not have been concerned that it would fall apart while lugging it to the car? They could have carried it carefully to the car and walked Nana out.