i have the problem a lot lately as i clean out stuff from my "that's cool!" period. If boxing it and mailing it if someone else pays the postage feels like too much trouble, just toss it.
especially if it doesn't work, as the two you mention seem to not. Maybe find a little kid who will like them as decorations/toys, or take them apart just to see how they work.
whichever, be at peace. At these prices, there's really no wrong answers.