Don’t beat yourself up to much, just because they said they sold it doesn’t make it true, they may have realized it’s true value and pulled the ad last minute. I sold mine on ebay 3 years ago for $500.
Im selling a bundle of A&A50 + Revised. Both sets are 100% complete, and both games have been opened but never played. (Revised pieces are still in the sealed plastic)
PM if interested or for additional info and pictures.