Charlie will forfeit a union membership card if you find his suitcase full of money from the High Roller's Lounge.
This is the low-spoiler guide for "Finding Charlie's money" puzzle in Grim Fandango. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.