Hope someone finds it. If you have an online Oyster account (assuming there was an Oyster card in the wallet) you can transfer the balance onto another card. Make sure you have stopped auto-top up. The card will still be valid if it turns up.Also, speaking from experience, be extra careful you are using the DVLA site if you need to renew your driving licence but, fingers crossed that won't be necessary.
Peter Higgins ● 390d