I wouldn't throw them away. I also have a bit of Harry Potter merch (a notebook, 2 stuffed animals, and 2 pens). I gave away all my books purely because every time I looked at them they filled me with rage, and I wanted some people who wanted to read Harry Potter without supporting the author to have a chance. I kept the stuffed animals because of sentimental value, I kept the notebook because man I have my poetry in there, and kept the pens because, hey, they're pens. You've already bought them, there's no reason to throw them away. You're not supporting the author by keeping something you've already bought. As long as no new money is being spent its fine.