I assume anything of any real quality was either drunk on site after hours or walked out the door loosely concealed under a jacket with the gradual displacement of the executives and senior management responsible for the previous glory days of the airline...
There is a part of me that aligns with your way of thinking here, although to be fair the article does say the Concorde Collection was cellared off-site - Barbados, New York and Toronto, so it wasn't like in a room in Waterside where it could so easily go walkies.