Historical clue formulations

• Decomposed — 2025-06-03
• Went bad — 2025-01-06
• Biodegraded — 2023-09-04
• Went bad — 2021-03-03
• Returned to earth? — 2018-08-26
• Spoiled — 2009-02-15
• Went bad — 2008-10-28
• Broke down — 2007-06-02
• Went bad — 2005-01-10
• Became inedible — 2000-01-16