Legalities of Rewrapped Games?

TheQuantumShift asks: "I'm part of a small video game retail franchise, and as such deal with corporate competition on a daily basis. Usually this is not a problem as we undersell the big corporate chains most of the time. One thing that really bothers us is the fact that these stores take opened, clearly used games, re-shrinkwrap them and sell them as new. One customer opened a shrink wrapped 'new' GBA game, only to find the previous owners receipt. Ex-Employees have confirmed the practice. This seems a little more than dishonest, and we would like to get them called on it. The trouble is, we have no idea where or who to start with. And exactly what proof we should have ready. We've been toying with the idea of contacting Sony, Microsoft, Nintendo, etc... directly, but I believe this isn't the way to go. As long as these big corps order tens of thousands of systems and titles, is Sony really going to care? Any insights would be much appreciated." Caveat, Consumer.