Name brand carving tools generally hold their value because there's not a lot of difference between a used tool and a new tool. But you have to find someone who wants the particular selection of shapes you have. Also, from looking at your pictures, a lot of your tools are palm tools and many carvers prefer standard handle carving tools - so you have to find the right buyer.
Because of that, I'd recommend you start at about 60 to 70% of today's new cost. For standard handle name brand carving tools, I'd recommend 80%.
If they don't sell at your initial asking price, gradually drop the price and eventually you'll find a buyer.
Mike
Go into the world and do well. But more importantly, go into the world and do good.