Need a switch box

I just inherited a 4-port 5200 that has everything EXCEPT the switch box.  Does anyone have an extra they would like to sell, or know of a source for a decent price?  The thing is, I don't want to spend a fortune because I have no idea if the 5200 even works.  Or the controllers could be shot.  I'm hoping some kind soul will help me get my 5200 collection started.

Thanks.