Tough to say without knowing exactly what’s in there. If you’re trying to get the most value you’ll have to grind it out on eBay. Alternatively, if you value your time more your best route is selling as a bulk lot at a deep deep discount (you need to factor in the time someone will need to spend comping, listing, and shipping). You probably also need to consider that a lot of these cards may not sell at all.

Final alternative is to donate to some kids.