The Daily Mirror Trophy is awarded to the 1st Helm overall at the National Championships. So holders should be the winning helm in the list of Past National Champions. The 1963 National Championship report describes the trophy as "a handsome winged silver cup", so it would appear the current trophy is not the original one.
The Derwent Trophy is awarded to the winner of Race 1 at the National Inland Championship.
The Directors Trophy is awarded to the winner of race 5 at the National Inland Championships.
The Dyno-Rod Cup is thought to have been donated at the 1989 Nationals (which Dyno-Rod sponsored), and is awarded to the Leading boat from Devon or Cornwall with Helm & Crew under 18 years of age at the National Championships.
The current Eastern Area Trophy was purchased in 2002 and is awarded to the 1st overall helm & crew at the Eastern Area Championships.
The Eastern Area Championship was first contested in 1989, so it's likely there was an earlier trophy which was lost.