I'm guessing they didn't need any slaves for hunting because slaves weren't even considered a full human, citizen. And the whites usually had alot of money. And hunting was a game they did almost every morning as competition and sport. The only people with privilege and money were whites. The slaves who were blacks didn't have the money nor the privlage or any laws to support them to purchase anything. If someone owned them, bought them like tools the slaves didn't have any right to anything. So that's why I think the fur industry didn't need any slave help because at that time the whites believed that the blacks were horrid beasts and other rude and offence remarks, and if they set them free and gave guns to them, the slaves would react and kill every white seen.
Hope this helps