Historical clue formulations

• Bulletin board material — 2023-11-11
• Isn't oblivious — 2021-01-01
• Classifieds, e.g. — 2011-10-15
• Picks up on — 2003-10-30
• Bulletin board array — 2002-07-12
• Observes — 1999-05-16
• Takes in — 1996-03-24