I'd say save it (although $50 seems a bit steep in a junkyard).
I personally don't need it, but I'm sure someone, somewhere, is hunting for one of those!
I've also not picked stuff up in the past, but later found I wanted/needed it, or met someone to whom it was the holy grail.
Attached are pictures of what it looks like inside, and also a lead from a technical manual that gives a lead on it's use.
Cheers