Okay, on the bag of guns page it says the Remington 870 Wingmaster was lost because the Governor had one in a Bag of Guns. It also says that was the gun Hershel used to fight off the walkers in Beside the Dying fire. The Governor can't possibly have the Remington 870 Wingmaster because Hershel had it in his hand after Andrea was already seperated. So The Governor most likely had another one in a Sheriff bag of guns.