Your average company is woefully prepared to deal with ewaste. If you sell it, there are legal and financial ramifications. Assuming you could make at most a couple hundred on a box, the labor to take it someplace, deal with finance, deal with legal, deal with returns for anything that goes doa in the move. The best you can do is sell or give it to a wholesaler who will give you near nothing for it to shoulder the risk.

Whenever possible, I release old hardware to end users. Refresh it, let them give it to their kids/family/whatever.