I am in total agreement here - my dogs are Hunt Point Retrievers - they HUNT! If I didn't have 6 foot fencing all round my garden and weldmesh runs they'd be on a fast bypass DEAD or a railway line DEAD. They are taken in the car to a woodland area with deer fencing around it for a good run every day, or to a nearby forest well away from traffic. The rest of the time they loll around in their runs or play with the zillions of old bones and toys we have lying about the place.
Good luck finding a home for them, but personally I wouldn't take two litter siblings of ANY breed let alone JRs. Far better to either separate them and re-home individually, or fence an area for them that they can't get out of. I would separate them anyway even if you decide to keep them, training will be so much easier. Loose dogs are never a good idea, even in the midst of the country.