Eggs purchased at a Boston-area Stop & Shop are shown.
The cartons don't have DeCoster's name on them. But an egg producer stamps its plant number on each carton. Shaw's, Stop & Shop, Hannaford, and Market Basket, under their store brands, are selling row after row of egg cartons stamped with Plant 1492, Plant 1021A, or Plant 1021B, which are processed by Dorothy Egg Farms.
Matthew J. Lee/Globe Staff Photo