Upon Putting Away an Old Coat

I cannot recall the occasion for the card,
Or whether the picture on the card
Of two bowls of blueberries
Held any significance,
Or what prompted her to write
"I feel I've done nothing for you."
I only recall slipping the card into the breast pocket,
Forgetting with intent, so that on this day,
I could discover at once
What I have carried all along.