When getting out my "travel things" for an upcoming trip to Paris, I found unused tickets from my 2014 trip. The tickets are in pristine condition, have the letters "stif" on an orange background, and are about 6.5 x 3 cm in size. Are these still usable?
Thank you for the very helpful transportation your website provides.
Theoretically the tickets are still valid if there isn't any imprint on the back (side with the magnetic stripe) showing their usage, since there aren't expiry dates on single-use Paris transit tickets. They may have become demagnetized (cannot be read by fare gates) but in that case you can ask for an exchange to new tickets at any Metro/RER ticket windows or offices.
Glad you've found the website helpful. Have a good trip to Paris.