Hi Shelley!
I'm not sure exactly what type of cards you've found, but I'm guessing you've either found some old Walt Disney World Resort theme park ticket media or some old Disney Gift Cards. Here's some ways to check and see if the cards have any remaining value:
1) If you've found a used Walt Disney World Resort theme park ticket, you can call and speak with a Castmember at Disney that handles existing ticket questions. They can be reached at (407) 566-4985. Sometimes, they may need you to email them a photo of the actual ticket media before they can answer whether or not your theme park ticket is still valid, or has any remaining unused, unexpired days on it.
2) If you've found a used Disney Gift Card, and need to check the balance to see if it has any remaining funds available, you can visit
disneygiftcard.com. To check the balance on your card, simply enter your Account Number, Security Code, and Verification value in the spaces provided. These numbers can all be found on the back of the Disney Gift Card. You can also check your balance by calling 1-877-650-4327.
I hope this helps! Have a magical day! - Diane W.