I live an hour or so from the plantation hogzilla was shot on. This plantation has guided hog hunts... the word around here is that she was a pen raised hog used for breeding and stocking the plantation. She supposedly escaped and was later shot. Some think that this is the reason there was no mount and not butchered... because it was more or less a "pet" pig.
Again, this is just rumors, so I don't know how true it may be.