I'd have to check, but IIRC the culprits were from Chateau de Pommard, bought in the early 90s. So probably vintages from the late 80s or very early 90s.
I had also bought reds from Rebourgeon-Mure, also in the early 90s. IIRC those were mostly Volnay, drunk reasonably successfully 8-10+ years later, but they were also slightly underwhelming versus price paid. I kept wines in my father's cellar in those days as we were moving all the time, and it really wasn't the greatest cellar for keeping wines more than 3-5 years. It seemed to accelerate everything.