Well, I had two Reflect Rings when I got to that fight, so I assumed both came from the AH. If one came from a chest somewhere, then so be it. I will check it myself too, just in case. When I actually played through, I only hit the AH a couple rounds and got that Reflect Ring. This time it took more like a dozen rounds to get just one... lol.
And yes, I cheated to get back to that point again. I wanted to find and (potentially) verify the situation, since I knew I had gotten at least one Reflect Ring from the AH. But I didn't cheat on my actual playthrough. Cheating is sometimes fun for a game you've beaten at least once or twice, but it'd sort-of ruin the fun of playing this hack I've been waiting years for if I had done what I did on that save state to get to the AH as quick as I did.
Edit: Well, now I have no idea where my second one came from, but I too ran through at least a dozen and a half runs through the AH, and as you noted, another one never came up. I apologize for jumping to conclusions, I didn't realize you had the Reflect Ring flagged as a one-time drop at the AH, so I figured when that one popped up, there was the chance of more and that I had acquired both there.