Another question, this for the baseball fans out there:

I have a box of signed souvenir baseballs that CMM left behind. I know nothing about them. I think he would have mentioned if they were truly valuable. On the other hand, he did have professional sports connections through his work in telecom sales and has a couple other items like a personalized signed photo of Julius Erving. Do you have any idea how I can tell if these baseballs have value? One for instance is signed by Joe DiMaggio. Several appear to have been signed by an entire team?