Did you ask 'a knowledgeable' person at the store if they had the missing parts?
Research the missing parts, get pictures. Bring something in to donate and then ask for the manager. Take the pictures in with your name and number and give it to the manager. He may say he can't do it but it would be worth a try for me...be real nice! Talk to them in the back room where donations are dropped off...cause that's where you want your pictures and info to be...where the workers can see it coming in.
I'd also be checking every day if it were close enough to my house.
Maybe that special someone will donate the missing parts IF they came across it. Perhaps they're clearing out a house or basement.
Good luck.