優待 ゆうたい けん
yūtaiken

Noun

1. complimentary ticket; courtesy card; discount coupon

うん。確 たし使 つかってない優待 ゆうたい けんもどこかにあったはず。
un. tashika tsukattenai yūtaikemmo dokokani atta hazu.
Yes. I'm pretty sure there are complimentary tickets that haven't been used somewhere.