I suspect he's trappin'em. I don't know particularly what your feral hogs look like in Fla. but here in North Central Texas, they don't look anything like domestic other than some color variations. Here some are black, some red, some spotted, some even have a Hamp strip across their shoulders but, not many.
I have read articles of boars and sows hanging around domestic pens I suppose for the company, or wanting to breed. I haven't personally seen this, but it makes sense.
Sounds to me, like your neighbor may be "intercepting" your hog hunting, and maybe SELLING those hogs to canned hunt ranches
, and coverin his tracks with hunters like you. Maybe, maybe not. Is it legal to transport feral hogs in your state?
Per his butcher, there are a myriad of diseases feral hogs carry, with sudo rabies just being one. I would not gut a feral hog without rubber gloves on, but in the last few years I wouldn't a deer either. I mean you can get tape worms by eating under cooked beef cattle.