There is no confirmation yet that it truly is glitch free, nor that it is mail order only. The way that I purchased all of our copies years ago would have indicated neither as very likely. The glitch thing I might agree with, but since you have to play co-op to figure it out, it isn't something I've done with that game (I can't say that I play every game the GOAT Store carries, sorry ). I labeled them as grey, and maybe it was just that no one was looking for that variant. All I'm saying is that the eBay auction most definitely wasn't the first known discovery of that cart.