I'd move on and not worry about it. I think you got a good deal, not the best deal ever.

First, that's Dura Ace 7700, 9 speed and rather old. Likely the components are fairly worn. Dura Ace 7800 came out in 2004. So either this bike got the last of the 7700, or the bike is a bit older than stated.

Second, Carbon frames have gotten a lot better in the last 8 years. So even though this is a nice Calfee frame, you can get as good or better today cheaper.

I think you can find other at least comparable deals.