The guy is selling them as a PACK . for bushing and maybe flushing. He don't want his dogs going to ground and spoiling his day.
He says there's a lot of years breeding gone into this pack to suit the type of hunting he does, and he's confident that they will do what he's says by giving a months trial. ( cant ask for more than that ) A lot of peoples permission has many badgers on them or foxes, the terriers would be forever going to ground. This guy says his pack doesn't .
If you want a digging dog theses aren't for you
Good luck with the sale