That doesn't seem right. Instead of trying to make sure it goes into the hands of actual paying customers, or throwing it away so no one gets them they let a random guy have them for free so he can turn around and sell them for a personal profit seems like a shitty thing to do.
If nothing else they could price the empty boxes and stack them on the shelf then put the games in them as they sell them. Or just throw them out so no one takes advantage and it's fair to everyone.
The first option isn't going to happen because of space issues. Gamestop has chosen to get rid of these to clear it up. We can disagree with that choice, but it is their choice ultimately.
As for the second, hoping to see good cases and manuals destroyed, creating further scarcity in the future, for some sort of arbitrary fairness is stupid. I've been given cases before by Gamestops too, happens all the time. I don't sell them mind you, but who ultimately cares? It's a good thing that these are back out there and not just being destroyed. The guy selling them is likely making peanuts considering what these go for on their own anyway.