Wow, they left quite a hole. while the plants ae not native here, I agree, its scary to think that this could have been the native Pitcher Plant or orchids or any other Pine Barrens species. This is exactly why I do what I do with plants so that folks have affordable access without having to resort to poaching.
I would have to agree with others that asking Rare Finds to watch for someone offering to sell them. Otherwise I only once knew of one guy in Cumberland county who did many different Pitcher plant, but can;t remember his name. I would look at Craigslist and eBay maybe a little later as if the perp took them to sell, they will most likely pot them up and sell in the spring. But it certainly would 'nt hurt to check now also.
As far as the invasive species removal, I know strike teams are mostly focused on species like purple loostrife and such. I doubt these trumpets are invasive; I didnt even know there were any around these parts.
But it would be nice to find out what happened so at least we know. Is the property private? maybe the owner tore them out.