Keybear I may not would sell it. I absolutely would check out the entire thing at this point. I would slug the barrel and measure the slug with a caliper (should be .429 +- .001 or so), while also making sure there were no "skips" while driving the slug through. I would do the revolver checkout in the revolver forum (10 year anniversary one). I would also slug each chamber in the cylinder and check it with a caliper. The chambers should also be fairly smooth. If everything checked out ok, and the fit/finish/action smoothness/trigger is on, maybe keep it if you like it. I know it would be hard to have confidence, and if you can't get past it I would understand. None-the-less, the guy did a fast turn-around on sending it back with repairs. I also sort of understand him not wanting to talk to you because he knows he messed up. It's not an excuse, he should still answer you and face you as talking to you and apologizing may help you feel confident in the revolver, but I can understand that he might be embarrassed.
At the end of the day though, there is no way this thing should have shipped with brass still stuck in the cylinders. I mean everyone makes mistakes, but just the fact that you had to hammer stuck cases out of the cylinder before you even shot it shocks me. I'm willing to give folks the benefit of the doubt, one time, especially when they repair and return as quick as he did for you. But still... shipping a firearm with empty cases stuck in the cylinder is not a "simple mistake" IMO. I don't know, I would understand if you sold it but I'm afraid you'll take a fleecing on it if you're honest and fully disclose.