The old Taipei bus cards (not to be confused with the new Easy Cards for the buses and MRT) are being phased out and will be worthless after September. (I forget whether it’s the beginning or end of the month.) If you have any with money left on them, you can get cash for them at the information booths in MRT stations.
And the old MRT stored value cards too, I believe ?
My old stored value MRT card “expired” with NT$200 remaining. I was only refunded NT$20, a normal jouney fare, as I had paid the discounted NT$800 price for the NT$1000 card. I suppose I got screwed.
Now I’m riding around on a student Easycard to get my revenge.