JD,
The pigs here in Hawaii are more of the domestic variety. I' ve disected a lot of pigs (about 20) along with some nice boars and I' ve never seen this plate. They are built heavier than a deer, but no protective armor.

KalaniManu,
The biggest problem I' ve encountered was dogs, either running loose or someone poaching with them. Once the dogs run pigs through my area, the hunting sucks for a week. I hunt back far off the road so I don' t see many other hunters. I' m out there almost every Sunday evening, 4:00-dark