If you decide not to deliver the remainder of the items, I would first try contacting a Women's shelter in your area or another organization that would give the items to someone in need rather than a thrift store that will sell them. Or you can try posting on kijiji and see if there is another family that you can help?
I'm so sorry you feel like you were taken advantage of. Unfortunately there are a lot of people out there that feel entitled to everything while they do little to earn it themselves :(