How to use schematics in Mouse: P.I. For Hire

Schematics in Mouse: P.I. For Hirecan be found from the very start of the game, during the intro mission “Big Mouse, Little Hope,” when you’re chasing the mysterious character through the airship. Even when you make it to the Little & Big Bar and your office in Mouseburg, you’ll realize you still can’t use them yet. So what gives?