http://www.azcentral.com/story/news/local/scottsdale/2014/03/25/wyatt-earp-guns-scottsdale-auction/6857001/

Josephine did write "I Married Wyatt Earp", but she sold the publishing rights to the character mentioned in the linked story, and he created his own version of it, while reportedly destroying what Josephine wrote, so the book is of little value.

"While I'm here...what's your gut feeling on the amount of money..."

Um, I don't know, probably not nearly enough.  Time will tell.