If you can find a trusting soul you might get more out of it, but I'd not (and don't) pay more than $100 for a case that I didn't hear and see run and operate, and even then it's no guarantee that it's actually any good.
No different than an engine or a transmission. The majority of sellers out there are probably not scumbag, unfortunately those that are, have ruined it for most everyone else. I don't trust anyone on there anymore. I'll buy things from craigslst, but only when I think the price is worth taking the risk that I may just be throwing my money away.
FWIW, one of the two or three 241's I bought had somehow had a groove worn in the oil pump tube. Not much more wear and it would have gone all the way through. Not some catastrophic failure, but certainly not a piece I'd reuse....but the only way to know something like that is going on, is to tear the case apart, and at that point, you have to figure out how much your time is worth too. A decent chain runs what, $80?
Edit: Good point below. I assumed this was a 90-91 passenger drop for these trucks, but it could be for anything.