Thank you Very Senior Members for you input. I have checked the notes and they do not seem to have suffered at all. Out of an abundance of caution, however, I have removed them from the hard plastic holders and placed them in safe holders. While they did look nice in their former homes, I am the only one who sees them. And since I will probably dispose of them sooner rather than later, due to my age and the lack of family members' interest, any possible damage would hurt the prices.