The Great Train Rubbery - S1.E44

Droopy is the mail clerk on a train out West, and receives a package to deliver to a bank. Slick Wolf hears this, and he proceeds to try and steal it, figuring that it must be money. After a number of attempts, he succeeds, but is arrested by the sheriff. The package contains not cash, but "Wanted" posters for Slick Wolf. Droopy receives the reward for his capture. This is the last Droopy short.