Historical clue formulations

• What a slug may leave behind? — 2019-09-15
• Result of a sock in the eye — 2017-04-05
• Hit record? — 2017-02-05
• Evidence of a brawl — 2016-12-04
• Boxing souvenir — 2014-08-15
• Black eye — 2012-01-10
• Eye shadow? — 2010-01-08
• Sock production? — 2002-05-04
• Black eye — 1999-04-26
• Slugfest souvenir — 1999-04-04
• Eye shadow? — 1999-01-02
• Fistfight result — 1998-06-03
• Black eye — 1996-08-19
• Evidence of a fistfight — 1995-01-04
• Mouse — 1994-02-04
• Fight souvenir — 1994-01-19