Letters signed by president

My husband was a doctor and the Air Force and he has multiple documents there still encased from Bill Clinton and one other president what should I do with these items are they worth anything because of the signatures?

 

This subject can be tricky. I'm sure that there is no reason whatsoever to think these letters were not "from" the person you think they are, but most letters from presidents of the modern era were actually signed by secretaries or by "auto-pen" and not personally.

 

I would say it's best to show them in person to somebody who appraises items with signatures.