Besides getting period products from prop houses like this one, set decorators will scour the basements of local grocery stores, where shopkeepers often keep surplus products from decades ago.
Set decorators also do a lot of research into the consumer culture of the era, especially for a 50s piece, since consumer goods had a lot of influence on the decade's imagery.
This was all Rena DeAngelo's job, an Oscar-nominated set decorator who's worked on period pieces like " The French Dispatch" , " West Side Story" , " The Post" , and " Mad Men" .