Digging in the Rail Nomad Camp. - Go to the western end of the south rail, walk twelve spaces south, then use the Shovel in that space). You will be ambushed by three Rail Thieves!
Digging in the Las Vegas Golf Course. - Enter west-central Vegas - the center-left block of the city. From the entrance square, go two squares right, two squares down, seven squares right, and one square down. You will get the message, "It looks like something is buried here."