Quoted from boilerman:
if complete you should be able to make it work. missing is another story.
I know I have passed on machines that had those missing, knowing I would have a hard time replacing them.
even though we for the most part don't drop coins. them machine looks bare missing them.
Worse was I thought the game did have one but it is a United one. Just got to be patient I guess.
This is a great thread.
One of mine is missing the reject cover - no idea if it will or won't work without it.