I don't know if that would be feasible. Sierra's owner Activision, Valve, and Gearbox won't be quite happy with that. From what I've read up the complete copy was only giving to reviewers in Europe so assuming it's a PAL copy that more than likely be a white label disc. Now I honestly don't know to county of origin of where that leaked beta came from but finding a North American copy is less likely in this scenario. Also judging from
this forum post there was a copy that was assumed to be a later build than what we have right now which unfortunately fell through.