Sometimes people know what they are doing but screw up anyway. I got my 2nd IIfx (32MB ram, mint Mac II case, 2 new batteries) because the unit would not turn on and the owner did install 2 new prams. So I got it shipped and looked it over expecting some surgery to get it working, only issue was he had one of the battery in backwards. Turned the battery around and I have a perfectly good working IIfx.
Funny thing about that deal was he only charged me $20 shipped and still expected to make some money off of it, he shipped it media mail!