On Friday I did my rounds at the local Goodwill stores and spotted the red 402 mixing bowl for the primary set! I shrieked and picked it up to find out the color was heavily damaged and mostly worn away.
I think this bowl has seen it's days in the dishwasher. The bowl was $1.99 so I passed on buying it. I only have the yellow 404 primary mixing bowl so I was hoping the add this piece. Better luck next time, I'm sure I will see another one day.