Speaking from experience here -
Have the seller take numerous pictures of the games before they are wrapped to show condition, how STI wraps the games and once they are loaded on the truck.
When the games arrive, take pictures of the games BEFORE you unwrap them. Make the driver wait while you unwrap and inspect for any damage, unless the seller wrapped it and there is no obvious external damage. Make sure ANY damage or concerns are noted on the receipt BEFORE you sign it and they drive away.