Most are just distractions (for the "blue hand"). But you can dig through one of the pair of large trashcans to the right of the Underground Tunnel Tour entrance.
Look in the round trash cans to the right of the Tour entrance. Move the trash out of the way until you find the tickets.
There are two in one of the round trash cans to the right of the Underground entrance. You have to dig through the trash. (see related question)
They are in one of the two trash cans near the Tour entrance (under the garbage).
They are in one of the two large trash cans to the right of the Tour entrance Downtown. (see related question)
look in trash can move trash aside and you will see it.
They are in the trash can by the tour guide.The trash can with the lid off
Go get the tickts out of the large trash can
Its by the jazz house, or the tunnel. Its in a trash can.
If you go where the tour guide is and go to the right there's garbage cans there
There are two tickets to the sold-out Underground Tour in one of the round trash cans by the tour entrance (the one closer to the Cafe). Dig down through the trash to find them, and return them to their owner at the Web Browser cafe on Main Street. (see related question)
in the under ground tunnel you dig in the trash cans at night and you can return them to the owner in the cafe then he gives you one now you can go on the tour then you find the dragon peice
If you have the Underground Tour tickets, go to the Internet Cafe on Main Street and return them. If you don't have them yet, they are in one of the two large trash cans by the Tour entrance.