so we have some friends who shop at vintage/thrift stores a lot. These places carry some nice stuff that is not cheap. The other day she purchased a box of vintage Disney books (about 25 old story books) for their daughters. The box was wooden with a glass top so you can see the books. Many of the books seem like they were never opened. They got home and the girls opened up a few books. Falling out of each book was 4 park tickets and $400. What is a good way to find out if these tickets are still good. She told me they were dated 12/2010. We suspect they were gifted to some kids and the family just put them away. Spring cleaning happened and these were brought to the store. She paid $20 for the box of books.