I do see how these are close to "wrong size". But my interpretation of "bought by mistake" was that I didn't mean to purchase a thing, not that I meant to purch

I do see how these are close to "wrong size". But my interpretation of "bought by mistake" was that I didn't mean to purchase a thing, not that I meant to purchase a thing but it turned out to be the wrong size. It's also not "no longer needed" since that implies it was once needed, which it wasn't. But I agree that these are some of the more consistent options, out of all of the possibilities.