They're not that good on their own! Try looking around the slums a bit more!
go to lin lin and she will help you with that
okay so far I went all around the slums to the hobos, to the market place, I went and bought another pass to try to take to Lin lin but it doesn't give me any option other than nevermind when I talk to her?
Get a message
buy an ink pen and try to DIY your own perfect pass if you are still stuck.