This week I got a Rodimus Unicronus from Amazon. It was listed as being "Used", and described as having damaged packaging. It was more than a few bucks cheaper than getting a brand new one, so I went for it. These pictures show the extent of the damage.
Certainly not something they'd want to sell in a general retail setting, but far from the worst I've ever seen. Pretty minor, really. The tape wasn't cut and the robot inside seems to be in perfect shape. Not "used" at all. Good deal.
I actually have a lot more stuff besides this that I haven't even opened yet. Maybe I'll post all of that too someday.
Sayonara.